i have original rally gauges in my 69, at first the oil and temp gauges worked fine, the fuel always went way past full and stayed there. i ran it out of gas one day and the fuel gauge started working. now after redoing the interior,(removed dash for paint etc). the temp still works but the oil pres. pegs past high as does the fuel. i just checked the dash ground and added a jumper from the engine to firewall and replaced the crimp at the sender in the tank. am i missing something?how do i check the oil pressure sender? any ideas?