W123 dash panel - Page 2 - PeachParts Mercedes-Benz Forum

subman60 · #16 05-09-2018, 06:46 AM

Thank you for the suggestions. Sent my 1st post from work and was trying to get done ASAP. The instruments them them self are fine and I was thinking there was a printed circuit board on the back that was causing a the problem. In about a 2 weeks I’ll be able take it apart and look at it. He was using the odometer method to gauge when to fill up until either the cable or speedometer broke. It was making a high pitch whining noise behind the dash then the noise stopped & the gauge stopped working. Something else I’ll have to try and fix this summer.

Diesel911 · #17 05-09-2018, 09:03 PM

Quote:

Originally Posted by okyoureabeast

Guys guys guys! Hold on.

First OP, you're looking to repair your instrument cluster. The dash panel is the massive thing that covers well, the dash.

Diesel911 has it 100% on point. In fact, this is the first repair I do on any of these old cars.

Save your money before replacing these gauges, fuel sender, and other $$$ parts. Go to your favorite auto parts store and get a ground strap.

Run the ground strap from the back of the instrument cluster to one of the many bolts that attach to the firewall. Any will do. Attach both ends to a screw and screw it down.

Reconnect everything and see if this fixes the erratic gauges.

There's no need to cap off the oil pressure line if you don't start your car. If you have to, then of course cap the line or put the cluster back in.

I was speaking of the ground point that is located behind the Instrument cluster. However, still a good idea to check out the engine to chassis ground strap.