I've been worried about this for a while as well, i have a 92 and my oil pressure is always low, i talked to my local trusted mechanic and he pulled up the reccomended oil pressure for the 3FE and his computer said that safe oil pressure is anywhere from 4psi to i think 20psi? It would be nice to find some kind of gauge that screws into the sending unit hole to find out exactly where the pressure is at, something like a tire pressure gauge, from what i've been told the stock Toyota gauge is notorious for being inaccurate, Brad.