[in deep 72]

Good point Red. I missed that, and I work with engine sensors every day, LOL.

That's the difference between a sensor (give a defined temp or pressure) and a switch (just on and off) you'll probably need 2 sending units and add another wire. I haven't looked into it much due to going a different route, but it shouldn't be too difficult. I'd probably keep the factory system the way it is (your light) and add a sending unit and wire to run the new gauge.