Neither my temperature gauge nor my oil pressure gauge work. Rather than spend a lot of time chasing that down I've decided to wire up a few Glowshift gauges under the dash (temp, oil pressure, and transmission temp, all for less than $200) while I save my pennies for the Autometer cluster ($$$$).

Anyway, I'm trying to figure out what the water temperature sensor thread size is. All the parts stores say it's 3/8-18, but doesn't specify whether that's NPT, UNF, or something else.

While I'm at it, if anybody knows off the top of their head the thread size of the oil pressure sensor that would be handy too.

Thanks.