'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

[dixiedelux]

I'll be watching this post, Mike. I have a 6 volt tach that is no longer working properly.

[mike42]

Hmmmmm.....what make is yours ?

[Kurt in NJ]

does the tach have a provision to select different # of cylinders---if it does try moving the switch several times

[flathead 53]

the 6 volt tach from west tach will not work correctly especially at higher RPMs if it is not getting a full 6 volts ,resistor under dash cuts voltage to 4 volts .

[TJ]

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Check to make sure it has a GOOD ground.

[mike42]

Kurt....no way to adjust. It's a small 2" model.

Flathead......did you replace the resistor ?

TJ....I checked the ground and it's good.

Damn...worked great for 2 years !!

Thx guys.....Mike