# E30 M20 325 Tacho In RPM no signal

**URL:** <https://community.ecumaster.com/t/e30-m20-325-tacho-in-rpm-no-signal/5393>\
**Category:** GENERAL\
**Created:** [March 17, 2026, 5:12pm UTC](https://community.ecumaster.com/t/e30-m20-325-tacho-in-rpm-no-signal/5393 "2026-03-17T17:12:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Nakamoto](https://avatars.discourse-cdn.com/v4/letter/n/ad7895/32.png) [@Nakamoto](https://community.ecumaster.com/u/Nakamoto)\
**Post date:** [March 17, 2026, 5:12pm UTC](https://community.ecumaster.com/t/e30-m20-325-tacho-in-rpm-no-signal/5393/1 "2026-03-17T17:12:55Z")

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Hello,  
does anyone have a working RPM signal on an E30 M20 325 cluster?  
Maybe someone has a wiring diagram?

I currently have it connected to **AUX4** , but the cluster doesn’t show any RPM.  
Any help would be appreciated.