Calibrate water temp gauge?

[TimeLimitHit]

I'll leave my scanner plugged in and bolt it to the dash before wasting $250 on a gauge.

[beertestr]

no mine is a 5/8" its enormous. the one in the intake may be 3/8" but the one that was in the side of the head is 5/8". I tried several different things, tapping the head is not an option, some auto fan relays are coming in the mail soon it wont be an issue.

it's 5/8" diameter, but I tell ya, it's 3/8-18 NPT. It's goofy sounding I know, but I pulled the print (got a contact at GM) for the sender it says 3/8 NPT. I got an adapter from the Parker store, it's 3/8 NPT. Look up specs for a 3/8 NPT, here's a good reference. It's 0.675 (slightly larger than 5/8").. in diameter, no idea why that's called 3/8 NPT, but it is.

http://www.fairburyfastener.com/xdims_pipe_threads.htm

I'll leave my scanner plugged in and bolt it to the dash before wasting $250 on a gauge.

LOL.. I am doing the same thing with my TechII until I get the wiring worked out.

[dave89iroc]

it's 3/8npt because national pipe thread(NPT) is the thread on the outside of pipe, which is measured by ID(inside diameter), so, it is 3/8 ID pipe, threaded on the OD

[classic79]

Is there any problem with using an aftermarket like autometer sending unit to hook up the the factory guage. Or would it still be way off.

[TimeLimitHit]

it could work, as long as the sending unit resistance range was the same as the oe one.