1999 Rude with oil problem

[gds]

I'm a new member, as I've just found this site and seems to be very informative. As the title says I have a '99 Rude which has been running great, but we were on the lake the other day and after running it for a mile or so wide open I came to a no wake zone and pulled it back to idle, when I did I got a no oil alarm. After checking it out I believe that it is oiling since it has oil in the throats. I removed the oil pressure switch and put a gauge in and the needle was fluctuating madly, but appeared to be in the range of 3 to 9 lbs. Is it normal for a gauge to fluctuate like this and do you think that I am right in thinking that is the pressure switch, if not what else could it be? Thanks for any help that you can give me. Gary

[Bassmeister]

Please repost with your model and serial #'s It will help the guys to determine which engine they are dealing with.

[ssimpala71]

Its gonna pulse like that because the lift pump you installed it in is a pulse pump (lift pump). Check the pressure switch with an ohmmeter. You'll see it open and close as you add pressure to the threaded port (with a mityvac or equivalent). Im guessing not likely the pressure switch but more likely a faulty lift pump itself, pressure switch within the injector, or an open wire between the injector and emm