Redtop RPM signal Help

[ClowesClause]

i have a redtop and im trying to get an rpm signal going

now i have a hks evc 6 that has a rpm read-out on it (this is also suposed to help with boost mapping apparently idk) but its not showing a signal, just sits there at 0rpm....ive spliced the signal wire from the evc to the yellow/red wire on the ecu (ecu #62 pin #3), so my question is, is there another wire i should put it to?

also im supposed to have a dohc cluster in the car (it has the 110mph instead of the 115mph on the sohc, ill post a pic) but still no signal, the car used to have a rb20 in it so idk if that has any bearing on my problem

thanks in advance

[91ka24]

you need a twin cam cluster for the speedo to read right but the tach should be working regardless. have you tried getting an ohm reader and seeing if the tach signal wire has any power? it could be an issue with the ecu

[cotbu]

If you brought me this car, and explained to me this problem? What I would do is hook up consult and verify ECU and that it has a tach signal. If that happened then I'd know where the signal wire is. And assuming you've done a continuity test on the yellow/red wire and it's good to the ecu pin. I'd try the other yellow/red red/yellow wire just for kicks pin2 for j4 ecu's. if your harness is a redtop 62 harness the color would be red/yellow

Verify continuity on the yellow/red wire to pin3 on the inside of the ecu.

[KiLLeR2001]

I have a DOHC cluster but when my speedo died on me I swapped it with a SOHC speedo and it works just fine.