318i - 318is cluster rpm issue

[tpereir]

Hi guys,

Need your support.

I have a 318i 1985 (swaped with m42b18 E30 318is).

Since the purschase the rpm cluster never worked.

I changed the rev clock only with another One with econometer, changed the battery and km system kit but the issue remains.

As the 318i with m10 is electrónic I believe this is not an issue with connections but fell free to support.

Thanks in advance

[twright]

Sometimes the tach doesn't work because the SI board batteries are dead. Check them with a voltmeter.

[tpereir]

The cluster was tested and all fine.
New battery in but issue remains.
Regarding the cables between cluster and Ecu how and were I can check?

Thanks in advance

[fixedwheelnut]

Have you checked the diagrams on the wiki? read this bit about the C101 plug
https://www.e30zone.net/e30wiki/index.p ... Tachometer

Instrument cluster wiring diagram here
[url]chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.e30zone.net/e30wiki/images/ ... e30_84.pdf[/url]