Originally Posted By: Brad_C
Before you toss it, check the voltage on the actual sender wire and see what changes when you turn the A/C on. Then do it again from the body of the sender to chassis. You may have a very bad engine earth and when you turn the A/C on you raise the voltage on the engine a couple of hundred millivolts.
Gauges and electricity are not rocket science. Measure and diagnose.
too late, i think the gauge is toast. I turned ignition to acc today, and it does the full sweep as usual, but with the engine still not started its not showing zero, but 2.5 bar.
I am actually pretty lousy at understanding electricity, especially reading diagrams and understanding the concept of earthing. It was my weakest subject in school besides chemistry. It is rocket science to me. I re read the manual last night, and i noticed it says that - is to be connected to the battery, i connected it to earth. I tried disconnecting from earth to - on the battery but the gauge is doing the same thing now at the position before start. I wonder if I connected it to - on the battery I wouldn't have faced these loading problems...
Anyway I will update you guys on whats going on with the pros later today.