My oil pressure gauge stops working and tried to ground it out at the sending unit off the block and nothing. If I put 12V too the wire going to the sending unit it will peg out to the right and then will work for about 3 hours and will do the same thing. It will stop working and I pull the sending unit wire and put a 12V source to it it will work again for a little wile. Would this sound like a bad ground at the dash to the gauge or is the actual guage ?
I don't have very much electrical background so any help would be great.
Thanks