Info needed: 1967 M38A1 Lubrication?

[rob love]

That's funny, I see the photo just fine. Google M-series temperature sending unit and lots of photos of it will come up.

I am sure there is a proper range of ohms that could be compared at various temps for both the gauge and the sending unit, but I can't tell you what they are. In the army, parts were cheap. We would just change whatever half was easiest, and if that didn't work, we would change the other part. A word of caution when working on the panel. It MUST be grounded before you turn on the ignition switch if you have it off the dash, or you will almost instantaneously burn out any or all of the gauges (oil, fuel or temp). Other vehicles like the M151 actually had a ground wire from the body to the dash,the M38a1 did not. The gauge case must be grounded. Too often, guys would test the gauges by putting power to the smooth connector, and ground to the ribbed connector. The needle might move back and forth, but the damage will be done.