I'm relatively new to the diesel world and a recently purchased an older bus that I converted to a camper. As a result I have many questions. First a little background: This is a used bus with over 200,000 miles. I know little about the service history unfortunately. The bus has a 180 HP Cat 3116. The engine starts easily and runs well as far as I can tell. The bus is able to accelerate to highway speeds (60ish max) and I've driven it about 500 miles this year without incident.
I'll start with two questions:
1. When I first start the bus oil pressure is about 50 PSI. Once the bus warms up (less than 5 minutes) the pressure drops to below 25 PSI. It varies while driving but it's never much more than 25 PSI. This seems low to me. What should I expect for oil pressure?
2. My speedometer doesn't work at all. Where is the pickup for the speedometer? Is there a common problem can check for?