Sigh, well, I tried that, the sensor that had the whacked out cold reading is the sensor for the gauge cluster, which works correctly. So it seems the computer's ECT sensor is working correctly/within specs according to my tests. So scratch off problems with the coolant temp sensors.

I also tested the CPS while I was at it: Reads 580 Ohms, the spec for M60s is 540 Ohms with +/- 54 Ohms, so it looks to be fine...I did not inspect the air gap.

Hmmmm what's next, fuel pressure test...