[Charlie Stylianos]

There is an oil pressure switch in the very front of the engine (firewall side) that will alarm of low pressure (red light in gauge). If you dont get this warning during warm idle, then I suspect your pressures are fine, but the sender may be bad.

Heed Bob's warning about using the large crows foot on the sender as the sender sits in a block thats attached to the case. Too much pressure with the crows foot and its very easy to crack the case (easier to see than explain). Its much easier and safer to disconnect the oil line from the block and remove sender/block as a unit. Mount the block/sender in a vise and now you can safely R&R the sender w/o worrying about cracking the case.