9000rpm

[E30SPDFRK]

My tach is off. It acts like it has a 4cyl tach in it because it redlines around 9000rpm, but I have tried 2 different 6cyl tachs and they both do this.

How do I fix this? Could it have anything to do with my cars stock 4500rpm redline?

[Doughnut]

hahaha, I'd say leave it like that - bragging rights!!!

"yeah, my car red lines at 9000Rpm"

Sorry for OT.

[dashboardmonkey]

You may need the correct coding plug for the instrument cluster.

[E30SPDFRK]

hahaha, I'd say leave it like that - bragging rights!!!

"yeah, my car red lines at 9000Rpm"

Sorry for OT.

Hehe, I have been doing that.

"watch the tach"
"holy shit, shift!"

You may need the correct coding plug for the instrument cluster.

What exactly is this coding plug? I have heard about it but don't know what it is. It has to do with whether you have a 4cyl or a 6cyl, right?

[E30SPDFRK]

Also, both the tachs I have put in are 7k, not eta ones.

[E30_Pare]

There should be different plugs in back of the tachs. Look in back of your eta tach and compare it to the back of the 318 ones. I believe the plug looks something like a relay.
Sorry don't remember off the top of my head.

[E30SPDFRK]

I know the tachs are out of 325i's, though; I pulled them myself. Don't you only need to change the coding plug if you go from a 4 to a 6 or vice-versa?

[dashboardmonkey]

The coding plug plugs into the front of the cluster behind the lower trim for the cluster.

Andy

[Jean]

late clusters = coding plug on the front lower right
early clusters = coding plug on the rear side

[E30SPDFRK]

But why is it reading wrong?

[SamE30e]

Hehe, I have been doing that.

"watch the tach"
"holy shit, shift!"

What exactly is this coding plug? I have heard about it but don't know what it is. It has to do with whether you have a 4cyl or a 6cyl, right?

Little white plug on the bottom right of the cluster.

[E30SPDFRK]

But why is it reading wrong?