Ambient Temperature gauge
 

Does anybody know what readings the ambient temp sensor uses? resistance to ground?

I had a thought today and wondered if it might work..

Rear view has the ambient temperature
thought about autometer sending unit and see what the readings showed and what the mirror gauge maxes out at.

If it works, thought about useing a 5 pin relay and putting the rear diff oil temp and the ambient temp to the relay. so i can flip a switch and can look at ambient or gear oil temps
:sigh:

ive been brain storming about nonsense today :jest:

I'll bet you anything the sender won't work with the stock gauge. I asked autometer the same thing about using their sender to control the stock trans temp gauge, and they basically said no way.

You can do what I'm doing, which is using a 2-1/16 oil temp gauge with a switch to switch between sensors around the truck. Right now it's only hooked to the trans oil and engine oil, but I have thoughts of adding the wires and sensors for the water and diff temps. The gauge is in my ovehead console with a switch in garage door opener cubby, very clean IMO.

Try this see if it's what you are hunting for from gm manual.

Thats a pretty cool idea.

Thanks!!
Im gonna find that sending unit and test it.

The sending unit is located under the power steering cooler. The effective reading range is -40*F to 140*F and has a dedicated circuit. Good luck getting a non-programmable gauge to read it correctly, though.

LT GRN / BLK is the signal wire.
BRN is the reference wire.

Doh... there went that idea....

thanks everybody.

Yeah....... I searched last night to find a regular RTD that can follow that resistance pattern and nada..... Cool idea but because of what GM chose to use you are SOL.

ive always wanted to use that as an iat sensor. seal it into intake pipe and always see iats up there

It wouldn't work for that either, the sensor is designed in such a manner that it will skew unless exactly where GM mounted it. If you put it in the tube, it will heatsoak and be unreliable.