[Riche]

"Usually two sending units for oil pressure--one for computer at back of distributer and one for gauge by left side exhaust manifold on block. The one for the computer controls the fuel pump."

Thanks for the heads up. Have you seen this happen before? I don't see how a fuel pres. could make that tapping noise. and then go away as my gauge comes up. Would that give my truck a little stumble at hwy speed? I need to get a diagnostic scan tool bad....