3.2 head temp sensor.
 

Wonder if I have this understood correctly. A 3.2 head temp sensor is a variable resister that filters a low voltage signal to the DME changing the fuel mixture as the engine warms up. My understanding of one other component of that system is, once warmed up, the DME has a default chip or driver that will deliver the correct fuel mixture regardless of the what the head temp sensor is doing and as long as the engine is at operating temp. I suppose I could warm up a 3.2 and unplug the sensor to find out, but it may be a bit more involved than that, so thought I would ask. Thanks for any illumination offered. Bob

Yes it is more involved, I know an open head temp sender will cause a no start! DME uses the variable output as one perameter for the mixture and timing.

From my experience, disconnecting the cht sends the DME into full rich and may or may not start.

Am I correct in assuming that:
Higher resistance (cold) produces a richer mixture
Lower Resistance (hot) produces a leaner mixture

You are correct Sir!

Perfect definition of a NTC (negative temperature coefficient) resistor.