Start by looking on the back of the binnacle. There is a multipin connector that carries, I believe, most of the gauge signal wires. There is a printed circuit sheet that routes signals to the guages, lights, etc. And there is a ground wire connection. I believe, but could be remembering wrong, that the oil pressure gauge may be on a separate wire.
As with any printed circuit sheet, you need to make sure that you are getting good contacts. Are the binnacle lights lighting? Are the warning lights lighting (brake, glow plugs, etc.)? If all of those are out, a bad ground is a pretty good thought.
If you want to, you can use a pencil eraser to clean the contact points on the printed circuit sheet. DO NOT use sand paper, garnet paper or any kind of scratchy thing.
If the paint job was thorough, including the interior primer and paint after removing things like the binnacle, you may find that the ground wire is not making good contact at the BODY end. Paint is not often a good conductor. You may need to ensure that the body end of the ground wire has good continuity to the body.
I don't know if it's possible, but you might have gotten the oil pressure signal line and the ground wire contacts reversed, on the back of the binnacle.
A simple multimeter will allow you to test for continuity of the ground connection to various points on the printed circuit card.
OF COURSE, check to make sure that all of your fuses are in place and making good contact. Just rotate them in their holders to polish the contact ends.
Tom: '81 300SD; 360,+++ mi.; no fan (it just stopped dead)!
In a message dated 7/16/2012 7:59:29 P.M. Pacific Daylight Time, ajrn@hotmail.com writes:
My 84 300SD is ALMOST back on the road..
The body has been made rust free, then primered and re-painted..
She is beautiful! (Yes-- I will post pics)
Started the engine the yesterday-- no oil pressure gauge/temp/fuel or speedometer. *yeah, I drove it around the block* I was reasonably certain I had oil pressure.
I'm assuming there's a missing ground wire-- that would make sense of this malady??
Anyone got a place to start looking??
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