New Tachometer shows 70mph at 4100+ RPM, problem?

[Prost]

I just install a new cluster and all gauges are working expect that the Tachometer is like 3500+ RPM at 70mph and 4100+ RPM at 80mph...what is my problem? It is a 7000 RPM Tach and it's from a 325i (fit my car)...

[MNE30]

Do you drive a 318? Or is it the 325iC we are talking about?

[Prost]

Do you drive a 318? Or is it the 325iC we are talking about?

325iC and the cluster is from a 325i...

[jlevie]

It sounds like that cluster has a 4-cylinder coding plug.

[MNE30]

It sounds like that cluster has a 4-cylinder coding plug.

That's what I was getting at.

Should be at the bottom of the cluster in between the temp and tach gauges.

[Prost]

It sounds like that cluster has a 4-cylinder coding plug.

If that's the case, where to get the 6-cylinder coding plug? If my old Tach is showing "normal/correct" RPM, can I take that the old one and put it in the new one?

How much and where to get a new one?

[Gregs///M]

Yup, keep the original coding plug associated with you motor/ecm. I have some spares around if you need one, from many different E30's. PM me tho

[Prost]

Yup, keep the original coding plug associated with you motor/ecm. I have some spares around if you need one, from many different E30's. PM me tho

Thanks for your offer, I will just put in my old one and see what happen first.

Again, thanks for your brotherhood love :p

BTW, anyone have picture of the plug and location?

Thanks

[smitche]

Bottom center of pic.

[Prost]

Bottom center of pic.

Thanks

[Prost]

This is the one on mine...



It said:

BMW 23
1394321
S.91 003

[smitche]

yeah, that coding plug is for a 318
I literally just swapped the same one out. LOL

[Prost]

yeah, that coding plug is for a 318
I literally just swapped the same one out. LOL

Good to know, so in my case , I can just swap the old one to this one, right?

[Threehz]

325i only doing 80mph at 4.1k? What kind of diff is that with?

My 318is is just over 90mph at 4k..

[smitche]

Good to know, so in my case , I can just swap the old one to this one, right?

yes, just swap your original.