I have a 525 100hr and once or twice after starting is show no oil pressure so shut down and restart and it's fine.. I was told they used cheap roller rockers and the bearings would come out and can get stuck in pick up and cause this any truth?? Second if I need to replace them this winter Is there any lower end upgrades I can do why I'm in it??? I know power cost money but just didn't know if maybe a cam or different intake helps any.

More likely a bad sensor or loose, corroded, shorted wire.

Rockers are in the top end. All you have to do is remove the valve covers to change them.

Lots of different upgrades are available to you. Depends on your goals and budget.

https://www.google.com/#q=525+efi+up...fshoreonly.com

Sounds like a sensor or guage issue