93 Tach reading high

[captaudi]

Afternoon,

This afternoon on the way home from work my tach got all funky on me, and not in a good way. Its reading almost exactly double. Normally around town in traffic I shift approx 4k rpm. Today it was showing more like 8k. As soon as I got home I grabbed my fluke and checked system voltage. 12.74V at idle 14.2V at about 3k rpm.

I looked in the archives and this does not appear to be a common issue. There was one post where FJ4ever adjusted a pot on the back side of his tach fixing his issue. My feeling is in a perfect world that should not need to be adjusted.

Anyone seen this and what did you find?

Thanks,