Ok, built a lot of cars over the years but I've never seen this. I finally got the 5.0 swapped into my 95 and running. All seems fine expect for the oil pressure gauge. Now it worked before with the old engine so I tend to believe the gauge itself is fine. Also, I do know that stock gauges are crap. BUT, This one goes up and down as you rev the engine. At idle it is all the way to the left. If I press the gas pedal it shoots over to normal. Literally, just like a mini Tach. Has anyone seen this before? I'm going to try the easy obvious fix and replace the oil sending unit. I need some ideas guys, I'm going to be upset if the oil pump is bad.