After Market Tachometer (tach) Install ?? Help Please ?? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

scca_civic · 03-06-2006, 01:52 PM

I got an aftermarket tach. To put a long story short. The tach will not read the yellow/red wire from the ecu. So after check some posts, I tapped into the CAS wires - I currently have it tapped into the WHITE wire.

Here is my problem. The tach will work upto around 3.5-4k rpms, but then it will not rev any higher then that. I don't know what else to do, please help.

Thanks

SCCA_Civic

89 Nissan 240SX with SR20DET.

RedtopTech · 03-06-2006, 05:33 PM

may i ask why you are putting a second tach on your 240?

P4rD0nM3 · 03-06-2006, 06:20 PM

1. His oem meter's fucked up.
2. More accurate (Perhaps).
3. CUZ MOST PEOPLE DO THAT! AND I WANT ONE TOO!
4. Random.
5. Dunno what he wants.

scca_civic · 03-07-2006, 07:33 AM

Because I don't want to use the factory Gauge cluster - I don't care about my Speed - just the engine temp, oil temp, oil press, rpms, fuel level, & boost. I hate the look of the stupid pods the mount on the pillars. So I am going with a custom dash - I have access to a water jet machine and I am a designer, so I will lay everything out and have a nice clean cluster with the gauges I want to fit in the space I want and so no one else will not whats under the hood if they walk by(its a sleeper - everything hid (except for the exhaust)).

jaja · 03-24-2006, 10:16 AM

so did you figure out which wire to connect it to? I'm interested in a tach myself - not sure which wire to get the tach signal from.

thx

naed240sx · 03-24-2006, 11:43 AM

Quote:

Originally Posted by jaja

so did you figure out which wire to connect it to? I'm interested in a tach myself - not sure which wire to get the tach signal from.

thx

I installed a shift light in my last 240, and I spliced the signal wire onto one of the wires leading to the coil. I believe it was the green wire.

jaja · 03-24-2006, 11:50 AM

hey thx. I'll test it out. 'cause some people say take it from the ecu, etc.

the green wire is probably right. the wire i need to connect out of the tach is green too

g6civcx · 03-24-2006, 11:50 AM

Quote:

Originally Posted by RedtopTech

may i ask why you are putting a second tach on your 240?

Stock tachometers are notoriously inaccurate, especially in the upper quadrant of the rev range. We don't have to discuss the merits of having an accurate tach, but that should answer your question.

DJPimpFlex · 03-24-2006, 06:13 PM

+1 for custom gauge cluster. I was working on one, but other stuff came first..... All that works on my stock cluster now is my tach, lol. I dont even know my fuel level...

808DRFTR · 03-24-2006, 08:02 PM

On my SR i just used the red/yellow wire off the ecu and ran it straight to the tach, the yellow/red wire did not goto the cluster.

TanbouTaTsubasa · 12-18-2006, 03:08 PM

on the whole aftermarket Tach thing, be that Im new to all this shit I was able to wire most of it up just fine, I just can't find where to wire the backlight to it...

s13silvia03 · 12-18-2006, 03:17 PM

Wire it to your dash lights so it comes on when you turn them on.

smelly240 · 12-18-2006, 05:12 PM

ur so smart bryan - autometer tach helpline master

from nissanperformance

First, disconnect the negative terminal to your battery. The tach should have 3 or 4 wires. The black one is a ground and should be connected to a clean spot on the frame. The red one is a constant 12V source and should be connected to the positive battery terminal, or something that only gets power when the ignition is turned on. The green one provides the engine rpm signal and must be connected to the negative side of the ignition coil or tach signal connection point, usually a blue wire with an orange stripe (typically pin 3 on the ECU for lookup). It could also be called the TACH, TACH TEST, or DEC terminal and can be found in the service manual. On distributorless cars, the green wire will be connected to the tach output on the coilpack. If provided, a blue or white wire for tach illumination should be connected to a circuit energized only when the lights are on.

s13silvia03 · 12-18-2006, 05:25 PM

He only asked about wiring the backlight

TanbouTaTsubasa · 12-20-2006, 03:28 PM

call me a lozr but I was chopping wires yesterday and I kinda gave up and went cheapo on it... I couldnt for the life of me find one that got power once the lights were on. I came up short every wire I tried. I got peefed and just wired it up to the freaking lighter power wire, so when my cars on acc. the TAC back light is on :P

prang11 · 12-20-2006, 05:03 PM

Quote:

Originally Posted by TanbouTaTsubasa

call me a lozr but I was chopping wires yesterday and I kinda gave up and went cheapo on it... I couldnt for the life of me find one that got power once the lights were on. I came up short every wire I tried. I got peefed and just wired it up to the freaking lighter power wire, so when my cars on acc. the TAC back light is on :P

Better your car than mine. All you need is a little power tester. Stick it in the harness plugs or wherever the wire is conecting to the factory gauges then flip the lights on and off till you find the right wire. No splicing required till you find the right wire.

docrice · 12-21-2006, 09:35 PM

Quote:

Originally Posted by TanbouTaTsubasa

call me a lozr but I was chopping wires yesterday and I kinda gave up and went cheapo on it... I couldnt for the life of me find one that got power once the lights were on. I came up short every wire I tried. I got peefed and just wired it up to the freaking lighter power wire, so when my cars on acc. the TAC back light is on :P

dude you were too close to what you wanted. I just tapped into the wire that leads to the light on the freaking cig. lighter. no need to tear anything else apart, easy peazy.

EZADesigns · 11-20-2013, 09:10 PM

I am having a problem with the Green Wire. When I put it in the right spot, it doesn't want to work it just goes up and down fast inbettwen 1000 RPM and 0 RPM. Everything else is hooked up and right. The White Wire is in the right spot and the light turns on, the Red Wire is in the right spot for the power and the Black is grounded. But, when I tried doing the Green one the tach doesn't want to do the RPM's right. Any sugggestions?

Thanks

Srsil · 11-20-2013, 09:40 PM

Dont u need to have a Dakota signal amplifier to run a aftermarket tach with a nissan because there signals are so weak

huffandpuff00 · 11-20-2013, 10:29 PM

some tachs cant read the sr signal. You can use a resistor like so:

resistor found at radio shack for .05 cent

*brndck* · 11-21-2013, 01:27 AM

many aftermarket tachs (like stack cluster) will not read off the factory nissan signal.
often times you must run a tach adapter like either the autometer one or the msd one.

03-06-2006, 01:52 PM	#1
scca_civic Join Date: Aug 2005 Location: Spring Hill, Tennessee Age: 43 Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	After Market Tachometer (tach) Install ?? Help Please ?? I got an aftermarket tach. To put a long story short. The tach will not read the yellow/red wire from the ecu. So after check some posts, I tapped into the CAS wires - I currently have it tapped into the WHITE wire. Here is my problem. The tach will work upto around 3.5-4k rpms, but then it will not rev any higher then that. I don't know what else to do, please help. Thanks SCCA_Civic 89 Nissan 240SX with SR20DET.

03-24-2006, 10:16 AM	#5
jaja Zilvia Member Join Date: Apr 2002 Location: Torrance, CA Posts: 179 Trader Rating: (0) Feedback Score: 0 reviews	so did you figure out which wire to connect it to? I'm interested in a tach myself - not sure which wire to get the tach signal from. thx __________________ 93 S13 Vert: KA, 5 Spd, intake, exhaust, coilovers, etc 94 bronco: 6"+35"

03-24-2006, 11:50 AM	#7
jaja Zilvia Member Join Date: Apr 2002 Location: Torrance, CA Posts: 179 Trader Rating: (0) Feedback Score: 0 reviews	hey thx. I'll test it out. 'cause some people say take it from the ecu, etc. the green wire is probably right. the wire i need to connect out of the tach is green too __________________ 93 S13 Vert: KA, 5 Spd, intake, exhaust, coilovers, etc 94 bronco: 6"+35"

03-24-2006, 06:13 PM	#9
DJPimpFlex Post Whore! Join Date: Jan 2004 Location: Rohnert Park, CA Age: 38 Posts: 6,158 Trader Rating: (115) Rides Gallery: DJPimpFlex Feedback Score: 115 reviews	+1 for custom gauge cluster. I was working on one, but other stuff came first..... All that works on my stock cluster now is my tach, lol. I dont even know my fuel level... __________________

03-24-2006, 08:02 PM	#10
808DRFTR Zilvia Member Join Date: Nov 2005 Location: San Tan Valley, AZ Age: 39 Posts: 172 Trader Rating: (3) Feedback Score: 3 reviews	On my SR i just used the red/yellow wire off the ecu and ran it straight to the tach, the yellow/red wire did not goto the cluster. __________________ 808 All Day, Livin The HILIFE!

03-06-2006, 05:33 PM	#2
RedtopTech Zilvia Member Join Date: Dec 2005 Location: Virginia Beach, VA Age: 38 Posts: 293 Trader Rating: (0) Feedback Score: 0 reviews	may i ask why you are putting a second tach on your 240?

03-06-2006, 06:20 PM	#3
P4rD0nM3 Zilvia FREAK! Join Date: Jun 2005 Location: Not Applicable Posts: 1,183 Trader Rating: (0) Feedback Score: 0 reviews	1. His oem meter's fucked up. 2. More accurate (Perhaps). 3. CUZ MOST PEOPLE DO THAT! AND I WANT ONE TOO! 4. Random. 5. Dunno what he wants.

03-07-2006, 07:33 AM	#4
scca_civic Join Date: Aug 2005 Location: Spring Hill, Tennessee Age: 43 Posts: 6 Trader Rating: (0) Feedback Score: 0 reviews	Because I don't want to use the factory Gauge cluster - I don't care about my Speed - just the engine temp, oil temp, oil press, rpms, fuel level, & boost. I hate the look of the stupid pods the mount on the pillars. So I am going with a custom dash - I have access to a water jet machine and I am a designer, so I will lay everything out and have a nice clean cluster with the gauges I want to fit in the space I want and so no one else will not whats under the hood if they walk by(its a sleeper - everything hid (except for the exhaust)).

12-18-2006, 03:08 PM	#11
TanbouTaTsubasa Join Date: Mar 2006 Location: california Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	on the whole aftermarket Tach thing, be that Im new to all this shit I was able to wire most of it up just fine, I just can't find where to wire the backlight to it...

12-18-2006, 03:17 PM	#12
s13silvia03 Zilvia Addict Join Date: Feb 2003 Location: PA.....I always thought that dogs...umm...layed eggs, and I learned something today Age: 38 Posts: 628 Trader Rating: (0) Rides Gallery: s13silvia03 Feedback Score: 0 reviews	Wire it to your dash lights so it comes on when you turn them on. __________________

12-18-2006, 05:12 PM	#13
smelly240 Nissanaholic! Join Date: Oct 2006 Location: Philaburbia Age: 46 Posts: 2,137 Trader Rating: (4) Feedback Score: 4 reviews	ur so smart bryan - autometer tach helpline master from nissanperformance First, disconnect the negative terminal to your battery. The tach should have 3 or 4 wires. The black one is a ground and should be connected to a clean spot on the frame. The red one is a constant 12V source and should be connected to the positive battery terminal, or something that only gets power when the ignition is turned on. The green one provides the engine rpm signal and must be connected to the negative side of the ignition coil or tach signal connection point, usually a blue wire with an orange stripe (typically pin 3 on the ECU for lookup). It could also be called the TACH, TACH TEST, or DEC terminal and can be found in the service manual. On distributorless cars, the green wire will be connected to the tach output on the coilpack. If provided, a blue or white wire for tach illumination should be connected to a circuit energized only when the lights are on.

12-18-2006, 05:25 PM	#14
s13silvia03 Zilvia Addict Join Date: Feb 2003 Location: PA.....I always thought that dogs...umm...layed eggs, and I learned something today Age: 38 Posts: 628 Trader Rating: (0) Rides Gallery: s13silvia03 Feedback Score: 0 reviews	He only asked about wiring the backlight __________________

12-20-2006, 03:28 PM	#15
TanbouTaTsubasa Join Date: Mar 2006 Location: california Posts: 19 Trader Rating: (0) Feedback Score: 0 reviews	call me a lozr but I was chopping wires yesterday and I kinda gave up and went cheapo on it... I couldnt for the life of me find one that got power once the lights were on. I came up short every wire I tried. I got peefed and just wired it up to the freaking lighter power wire, so when my cars on acc. the TAC back light is on :P

11-20-2013, 09:10 PM	#18
EZADesigns Join Date: May 2013 Location: Fresno Age: 31 Posts: 17 Trader Rating: (0) Feedback Score: 0 reviews	I am having a problem with the Green Wire. When I put it in the right spot, it doesn't want to work it just goes up and down fast inbettwen 1000 RPM and 0 RPM. Everything else is hooked up and right. The White Wire is in the right spot and the light turns on, the Red Wire is in the right spot for the power and the Black is grounded. But, when I tried doing the Green one the tach doesn't want to do the RPM's right. Any sugggestions? Thanks

11-20-2013, 09:40 PM	#19
Srsil Leaky Injector Join Date: Mar 2012 Location: Olympia Age: 33 Posts: 77 Trader Rating: (0) Feedback Score: 0 reviews	Dont u need to have a Dakota signal amplifier to run a aftermarket tach with a nissan because there signals are so weak

11-20-2013, 10:29 PM	#20
huffandpuff00 Zilvia Addict Join Date: Jul 2006 Location: oregon Age: 37 Posts: 835 Trader Rating: (9) Feedback Score: 9 reviews	some tachs cant read the sr signal. You can use a resistor like so: resistor found at radio shack for .05 cent