Tach befuddling behavior resolved but explanation required

[jaltman@altlaw.com]

I cleaned the cable and put it back in. Started the engine and noticed I had
not tightened the cable down, it was reading correct.  I tightened it up, it
rose back to 50% high. I cut about 5/8" off it and put back in.  If I
tighten it all the way down it still reads high, but if I leave the nut
about 2/3 loose it reads fine.

Sounds like the cable is a bit too long, but why would that make any
difference?

Jim Altman  jaltman@altlaw.com Illigitimi non Carborundum
http://www.altlaw.com/metro/jaltman.html    69-TR6#CC28754L  W4UCK