I know from searching that this issue has alot of posts so I will add mine. I just purchased my first vette a red 1986. All seems fine so far except the oil pressure readout on the dash stays at 80psi, running or not and never flucuates. Would this be a oil switch or oil sensor? The local gm dealer has both but I wasn't sure which one. Also if some one could maybe help with the location of the correct device I would appreciate it. I am still waiting for my parts book to arrive. Thanks in advance.