I'm running twin 525SC, in 35 ft. fountain, when stbr. oil gauge drops to 5-10 psi, but engine still performing great. after 20 min. gauge is back up to 40-50 psi. 2 weeks later port side does same thing. HELP!

I'd check your oil sending units and wiring. Maybe tap in a mechanical gauge to verify the pressures on each engine see what ya got...

I was having a similar problem. Hooked up a mechanical oil pressure guage to make sure that I wasn't having pressure problems. My problem was the wire to the sender was a push on connector. I just crimped it a little tighter and problem was solved