Join Date: Dec 2008
Location: Tyler, TX
Thanked 407 Times in 347 Posts
The oil sender is an idiot light switch, they fail - OFTEN.
Verify pressure with a mechanical gauge, it is common for the 6.9L/7.3L IDI engines to idle at less than 10 PSI hot, and as long as it is 6 PSI or more, and it comes up with RPM, I would not be too concerned.
I would use the next heavier weight oil, if oil pressure is tending to the low side. I don't know where you are from, but since it's January, and I don't see any snow or ice, I would say that you should be running 15W-40 year-round anyway.
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!