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"From what you´re saying i suspect someone transplanted in a meter and sender that works the other way."

I'm the on who did the transplant, way back about '72 or '73. I swapped an F-134 for the...

The original sensor was a thermostat/circuit breaker type of unit . Cold engine kept the switch closed, gauge internals heated up and moved the needle to the left. As engine warms, switch stays...

Well, so much for our eyeball guesses.

I went over to my local Fastenal and we looked through tap drawers until we found one that matched the threads on the sensor.

They're 1/4-NPT; technically...

Thanks.

I'm doing some fiddlin' with a gadget to use the modern sensors to drive the upside down gauges in the 46 - 49 trucks. I'm making a holding fixture to run resistance vs. temp curves; ...

Is the thread for the temperature sensor 3/8 NPT?

I know that there is an adapter for one of the heads, but I am asking about the basic sensor.