I broke the screw out of my original sender so I went to the marina and got a new one. Does not work. Checked oil pressure with a mechanical gauge. Pressure is fine. Does everything it's supposed to do. Sender shows 70 psi at idle and goes to 25 at anything above 1500 rpm and stays there. So, I tried a sender that Dyno had, gauge stays pegged at 100+ psi when engine is running. Obviously not the right one either. Do I need to get one from Gaffrig??? If so, how do I do this? Website???

Foul,
Not sure about correct sender or not, but you can give Ron Harris a call at Livorsi Marine/Gaffrig at 847-548-5900 ext. 223. He is one of their tech guys and does sales so he should be able to help you out.
Tim

www.gaffrigperformance.com

i have the same problem.ill see...

Neither sender on their web site looks like the one I broke.

Here is my dash. Gauges are about 10 years old.

Mike, I've been buying all my gaffrig stuff from Nisonger Marine in New York. They have way better prices than the Gaffrig catalog and have had everything I needed in stock.
Nisonger AutoMarine Inc
570 Mamaroneck Ave
Mamaroneck NY 10543
914-381-3600

Aggghhhh....didn't post. I'll try again:

Well shoot. I've posted this picture before. Oh well.

Mike, Call Wally. He'll get you set up.