lights coming on dim some times. I’m going to put n actual gage on it for better info. And go from there my question is What size threads is in the block where the sending unit is ? I’m sure plenty of people have done this. Should I get a gage that has the oil line going to it or I’ve seen some with sending unit and wires going to gage. Also. What is the oil pressure suppose to read at idle and 1800 rpms. Thanks for the time and help.