I HAD READ A FEW THREADS CONCERNING OIL PRESSURE , I KNEW ABOUT OIL PRESSURE ON SOME LARGER ENGINES BECAUSE I HAD A 82 GMC 4X4 PU AND HAD PROBLEMS WITH THE OIL PRESSURE SENDING UNIT. THANKS TO THESE THREADS AND REPLYS IT JOGGED MY MEMORY AND I WAS HOPEFULLY ABLE TO SOLVE MY 87 YJ's PROBLEM BY CHANGING OUT THE SENDING UNIT ON IT ALSO ,,,,,,SO FAR SO GOOD IT'S READING ABOUT NORMAL .......JUST WANTED TO SAY THANKS GUYS!