[Slonaker]

When I put the crate engine in my truck, it had a different size hole in the head for the sending unit. I bought one for a 70s model truck, and fit perfectly.

When I was breaking in the engine, it quickly overheated according to the gauge. I asked around here, and was told it might be different. I bought a new sender that was correct for my year of truck, and got a brass adapter from Lowes to make it fit. Temps were right where they were supposed to be.

Since then, I have seen the issue pop up on the board several times, and changing to the sender that matches the gauge has always resolved it.

Slonaker