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hmm since his isn't running, it may come to me to test anyway.

can you set the temp thing as a simple signal as well? ground or 12 volts to 90 instead of just no signal. and the rest as you described? don't want to have to rewire too much.

trinary is pretty simple.
it has the high low pressure switch for the a/c compressor, and has another high/low pressure switch to give an electric fan a signal. basically just passes current when it hits the high and opens when it hits the low.

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Ok, you or him, doesn't matter to me.

Yea, I can make it work like that, likely by grounding the sensor input (I'll be sure once the design is done). I think I still want to detect no sensor, but having an option to not install the sensor is a good idea as well.