I bought my stuff from a guy in Japan. It all came together with complete harness (i posted a pic of it a couple of pages back). Ive heard you can use other sensors but never tried them. You may have a point on that.
About the Heat issue. It blows as great. As hard as it used too with analog contros. Just doesnt get as hot. Kindo luke warm really. Still havent hooked wire 33 to blend door. Only thing i havent done yet. Hopeing that will help.
Here are pics of sensors i used:
Ambient Sensor(mounted in hole, secured for good measure with zip tie)
In cabin sensor w/tube, Sunload Sensor, Amp, Ambient Sensor:
I used an S13 housing with my JDM Amp(pic is before i loomed the wires and permenately mounted it)