My Morgan (54 Interium Cowl) never seems to amaze me. Took a long drive in the mountains over the weekend. The oil pressure gauge showed 50 when we left and then it went to 80. Stopped for a quick meeting of other cars and the gauge still said 80 when parked and engine off. Checked the oil, full. Decided to go ahead with the drive. The car ran great, oil gauge never came off 80. The in the 60 miles the gauge started working again. Back to 50. Oh the mystery continues. One thing I have learned over all the years with cars, if it works leave it alone. Some how it will work out.