I have? The engine is in a 2000 model year boat, 7.4 mpi. The plain 'ol 310 horse one.

Is there a cross reference chart somewhere?

Thanks guys!

MEFI 3
It will say it on the back of the computer.

Thanks Young.
I looked at what I could through the back of the mounting bracket and did not see anything that would id it. I guess I should have pulled it off to check. I want to get the scan software for a laptop, and they only work on a given mefi.
IIRC, I remember reading that mefi 3 is no longer available new?

They are available as remans only. You can get a stock replacement from Merc., but they are VERY expensive. Anyone who uses them to build aftermarket engines is hanging on to the ones they have.

Call Precision marine (MARK) he is one of the best 504-469-7463