Can anyone tell me what this is next to my oil filter. It's on my 6.9idi 1985 f250. The red wire is hanging loose. Trying to figure out where to attach the red wire. Thanks in advance. #ad

 

Looks like an oil pressure sender to me. Probably not stock judging by the wiring.

 

Clux, thanks. Yeah that makes sense but it does not look like the oil pressure switch is supposed to look like. And the location is wrong too. Isn't the oil pressure switch on top of the engine, center, near the firewall? Could my mystery pictured thing be a coolant temp sensor?

 

Maybe using it as an oil temperature sensor. Shouldn't be any coolant there.

 

Yep, I'm sure you're right. My truck, that I recently acquired, came with a box of random stuff and there was a temp gauge in there. I bet it was hooked up to that sensor at one point. Thanks man!