Help! The oil pressure gauge drops to "0" pressure at different times.Have had the truck towed twice to dealer and they can not find any problems.This has happen 10-15 times, now I just keep driving and pressure returns after a few miles.The fuel gauge,and odometer does the same at different times.Dealer can not find any problems.I had a seperate oil pressure gauge installed this week after it happened again.99 dodge 67,500miles.