Thanks for the input.
The sending units on the engine are shown as the boxes with the ohm readings. They are only one wire, and carry no power that I know of, the sensor grounds through the threads onto the engine block. They change resistance with temperature/pressure. This is a project I could really use, and I am hoping to give it a try. There aren't any projects I want to do that AREN'T automotive related in some way (I'm a car guy) so I guess dealing with the noisy electrical environment is something I might as well start dealing with now, haha.
This is a snapshot of the manual from Auto Meter.
