I replaced the oil gauge with one I got at the local dealership. I also changed oil and filter...used the low ash SAE 30. The old gague had trash in the inlet. The new gauge is very sensitive. For the first start of the day the pressure shows about half full scale, so thats ~35 psi @ idle. Once it gets warmed up (~180 deg F), the pressure rolls off to just above the red zone @ idle. At half throttle (warm), it will run ~20-25 psi.
Guess I'll just run it for a while and keep an eye on it.
My only problem now is that the engine stumbles somtimes under load and at idle. If I run the plows too deep, it will start missing...which seems like a carburetor issue. Mine has the Zenith. I see only one adjustment on the front of it. I know I have good fuel. My in-line fuel filter is clean. My aircleaner has the correct amount of oil and no dirt. Any ideas on this?