'40 Sedan Tach Problem

[mike42]

Guys.....

A couple years ago I bought a small 6V Westach Tach for my '40. For 2 years no problem and I use it all the time when shifting, etc. I normally idle at approx. 600 rpm

This year....I started up after Winter....the tach at idle is now way below "0" and at 55 mph it shows 1,000 rpm. Normally it would be 2,000 rpm.

So is it a....loose wire ....bad tach.....?

Thx and I appreciate any suggestions.

Mike