My oldest son (over in the desert right now) has a 2005 duramax that just before he left replaced the oil pump because from time to time the oil pressure would drop to 0-9 PSI with the warning buzzer going of. The cluster and the CTS read the same thing. Well fast forward my grandson is driving it and it did the same thing. What I'm thinking is that the cluster and the CTS are both feed by the same source so I would like to put a mechanical gauge on it to double check.
Here is the question
Where would be the best/easiest place to hook up a mechanical oil pressure gauge to a 2005 LLY duramax? I'm hoping that the grandson will be the muscles and I be the smarts behind this operation.
Thanks
Steve