Hey Everyone, Went through the forum and read all I can about diagnosing vacuum and oil pressure. I changed out my oil pressure gauge (mechanical) and temperature gauge (electrical). I need to add a vacuum gauge and tachometer. My question to all is what should the oil pressure gauge read at idle and at freeway speeds (55-60 mph)? I have a '70 FJ40 with a stock '71 F engine. The pressure at speed reads about 50-55 PSI and when I come to a stop it hovers at about 15 PSI. I read in the manual that the pressure should read 60 PSI at 4000 RPM. ??? I plan to add the vacuum and tachometer this week but the pressure concerns me since I don't really know what it should read. Thanks in advance for all your help and I am glad I fould this site.