So, a friend of mine gave me an Oil Temperature gauge that his dad used in his truck. His truck had a 460 in it.
I'm unsure if the fitting that's supposed to go into the block is the right size, and I don't know where it installs in the block. I also don't know where to wire it into. It has 1 white wire hanging out the back of it.
I really appreciate any help you guys can give me.

 

I bet the wire is for 12v for illumination.

 

See, Auto Meter

 

Is this a gauge or a sender? Sounds like you mean sender. Sender gets wired to gauge. I am unsure of block location.
-Mike

 

That's what I was thinking. Any idea what to wire it into?

 

Running light circuit.

Guess I should have been more clear, running light was way to general I see now. You'd want the Lt blue-red wire up under the dash, you'd want it wired into the dash lighting circuit as so its light would work with the dimmer function same as everything else.

 

IIRC it's the brown wire at the headlight switch you want

 

Excellent. Thank you!

 

The guage would have to get a ground somehow for the light to work tho