[rfmaster]

Originally Posted by jasons

rfmaster,

I see a couple pages back you were testing temperature sending units. I need one for the gauges in my 70, but the heads are threaded for a 3/8" sender and the one for my Blazer is 1/2". Do you know of a way to get around this?

If you are referring to a temperature sending unit (single wire) for use with dash gauge the closest equivalent is used by fords F5CF-10884-AA, F5CZ-10884-A.

At first look (TU201) measured:
45C 805 Ohm
98C 100 ohms

I have not had a chance to fully characterize this unit as I have been busy with other projects. It may be close enough to OE AC-Delco G1852 sending unit - after being fully characterized. Equivalent aftermarket replacement units are available from usual parts sources:

Autozone, Duralast / Temperature sending Unit: TU201
Rock Auto still has some from defunct parts maker Kem Parts: TW186

Are you sure that you have 3/8"NPT in your heads? Vortec heads are drilled and tapped for 3/8NPT sensor mounts, while common Gen 1 heads use 1/2NPT (aka dry seal).

//RF