Re post #38, since you have no air conditioner, do pins 2 and 3 of the car's sensor connect to anything at all (apart from terminals 10 and 33)?and I used two pins for Air conditioner.
That suggests the simulated resistance needs to connect to the +ve supply rail rather than ground, assuming the digital gauge works by simply sensing a voltage at the sensor.But there is a problem. After placing this circuit, the indicated temperature also increases with increasing resistance
Last edited: