If you had a bad diode, you would see other problems, like the battery running
down. It sounds like the electronic ignition is causing a triggering problem.
When the rpm's increase, it happens so fast that it appears to smooth out.
I've heard on other boards that a lot of people have a problem hooking up
tach's to aftermarket electronic ignition. I believe there is an
adapter/filter you can install in-line to help solve the problem. Good luck.
Steve
> From: wsamouce@kc.rr.com
> To: tigers@autox.team.net
> Date: Fri, 14 May 2010 21:57:01 -0500
> Subject: [Tigers] AutoMeter Cobra 8000 Tach installed
>
> Much Thanks to Paul R. Breuhan [prbreuhan@hotmail.com] for his screening
> services, I now have an accurate 8000 tach in my Tiger.
>
> http://i796.photobucket.com/albums/yy249/samouce/002-5.jpg
>
> http://i796.photobucket.com/albums/yy249/samouce/004-1.jpg
>
> I used the original gauge's class, outer and inner bezel too. This takes
> about 1 hour worth on modification to the autometer's case.
>
> Now a question for you all -
>
> I am having a problem with the needle jumping around when the engine is at
> idle. Once the rpm is over 2000, it reads correct. When I turn on the
> lights, at idle, it settles down a lot but still twitches. Sometimes when I
> start the car it read the correct idle for a few seconds and then starts to
> jump. I called the AutoMeter tech line and the guy thinks that I have a
> ground or 12v power issue. He suggested that the alternator may have a bad
> diode and is causing voltage problems at idle. I tried using different 12V
> sources with no fix. I also tried different grounds with no success.
>
> I am also using a accell electronic ignition kit in my distributer.
>
> When driving the car, the tach works perfect......until it drops to idle.
> Any advice as where to start?
>
> Duke
> B382002037
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