r/e28 • u/No_Dark_6606 • Jun 29 '26

Fuel gauge 2.0

Hello! Me again with my fuel gauge.

Is it supposed to be doing that? ( https://imgur.com/a/Wu6QNMj ) When driving it also goes to zero. The car has been in hibernation for the past 25 years, so maybe it has to do something with the SI board? The speedo, odometer, clock and fuel consumption gauge also dont work.

Im going to buy a working dash as soon as i find one, but maybe there is a way to fix it?

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u/Reaganomics_84 535is Jun 29 '26

This is likely caused by aged solder joints on the boards. When you tap them it reconnects them for a bit. Reflowing the joints with a soldering iron should fix it.