Tach/OBC both stopped working

[BMWManiac]

Tach needle doesn't move at all, but the boost needle in place of the standard mpg guage moves. The light bar on the OBC lights up, but no values.

I checked fuse 10/21, both are good. Woke up one morning, took about 6 times to start the vehicle. Other than that, they worked when I parked the car the night prior....very next morning, they stopped working?

[Gregs///M]

Replace fuses 10, 12, and 21.

[reelizmpro]

Try tapping the top of the dash above the cluster and see if it turns back on. Works for me...

[BMWManiac]

I did try tapping the dash, and nothing happened....I'll replace all 3 x fuses and go from there when I get home next week!

[BMWManiac]

Swap'd in another tach into my cluster and the tach didn't work. Put in that tach into my spare cluster and the tach then worked....looks like the IS board is causing the issue? The OBC worked too....good thing I bought a refurbished one from you, Greg!

Tach is on it's way to you today!

[e30rapidic]

SI board/batteries failure.

[izickc]

Post if u figure this out, ive put in 3 clusters and none worked

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[BMWManiac]

Post if u figure this out, ive put in 3 clusters and none worked

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I thought I did? Must be the SI board in the cluster....

[izickc]

I've replaced.the batteries in mine, still no luck!

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[BMWManiac]

I would swap out the board itself....there could be a broken electrical weld somewhere

[izickc]

Ill give it a shot

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