1991 RPM Gauge Problem
Thread Starter
Cruising
Joined: Jun 2000
Posts: 12
Likes: 0
From: Pikeville, KY, USA
1991 RPM Gauge Problem
My 91, L98, six speed has a RPM gauge problem. When I turn the key to ON the RPM needle slowly moves upward, when I engage the starter the needle pegs at 6000, when the engine starts the needle drops to zero and does not move anymore. I bought a used cluster which the owner says worked fine but when I installed that I had similar problem. Help.
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
Did this start happening out of nowhere?
Did the tach act whackey prior to this issue?
I am wondering if you have a tach wire at the dist problem, or if your tach filter has failed.
When the tach filter fails, the tach will start jumping around and be totally inacurate. If the tach wire is not plugged into the dist, it should be plain dead.
Your issue as you describe it is a new one on me. Maybe someone with similar issues will be along.
Did the tach act whackey prior to this issue?
I am wondering if you have a tach wire at the dist problem, or if your tach filter has failed.
When the tach filter fails, the tach will start jumping around and be totally inacurate. If the tach wire is not plugged into the dist, it should be plain dead.
Your issue as you describe it is a new one on me. Maybe someone with similar issues will be along.
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
Yeah that sounds to me like the tach filter.
It is mounted on the back of the driver side cylinder head. I believe it will have a white wire running into it from the distibuter. It looks like a cylinder, battery, capacitor etc...
The issue is, I dont know where you can get one.
What you can try to do is bypass it. One single wire. Tap in before, and after and see if it works.
I had it fail on me. I bypassed it, as well as used an MSD 6AL. no issues for me on my 90.
It is mounted on the back of the driver side cylinder head. I believe it will have a white wire running into it from the distibuter. It looks like a cylinder, battery, capacitor etc...
The issue is, I dont know where you can get one.
What you can try to do is bypass it. One single wire. Tap in before, and after and see if it works.
I had it fail on me. I bypassed it, as well as used an MSD 6AL. no issues for me on my 90.
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