what i do when i want to ck coolant emps oil temps in my 90 is hook up my auto xray 4000 scan tool that will give me real time data for hrs if i leave it hooked up . i even made a holder that fits in the cup holder so i can just leave it on while driving . i like cking block learns and knock counts etc . passes the time while on the freeway ,since every where i go is a couple of hundred miles away
