Re: oil pressure sender
As Dave suggests, if it is a mechanical gauge, having an oil tube to the gauge, replace the gauge with a known good one and compare.
If it is an electrical gauge, either the gauge is not grounded, the gauge is not getting ignition powered fused 12 volts, or the sending unit is not grouded through the threads, maybe has too much teflon tape about the threads?
Another check on the sending unit is to measure resistance engine off and engine on, from the terminal to engine block. Should be noticable difference. The gauge can be checked be checked out independently on the battery and ground. If a two post gauge, battery on one post ground on the other and needle should swing to full scale. If a three post gauge, battery and ground to their repsective posts, then momentarily touch ground the the sending unit termnial and meter should deflect to full scale.
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