Which Tach with MSD 6AL ?

[rbray]

Hi Guys,
Does anyone have a recommendation for which tack to use with an MSD 6AL ?

[Curt C.]

Most tachs will work with that box. Which tach do you want to run?

[rbray]

I have need to replace my SW. Somehow I manged to fry the **** thing and I need a replacement.

It worked fine for a while until I had a problem ( my fault ) with the MSD. After I replaced the MSD box the tach never worked again.

[rbray]

Come to think of it, I could have rewired the tach wrong.

Maybe someone could help me out.

Here are the the lables on the treminals of the unit:

SIG
BATT
GND

and a seletor swithch with the following positions.

A 4cyl
B 6cyl
C 8cyl
D Alt 12 pole
E None

I have the tach wire from the MSD connected to the SIG terminal
The BATT terminal has switched 12V on it and the ground is grounded on the aluminum dash ( like all of my other gauges are).

The needle either wanders or settles on 7k rpm.

Any Ideas?

Thanks

[Curt C.]

Sounds like it could be a bad ground. Check the ground and connections. Or, the problem with the earlier MSD box could have damaged the tach. Check your ground and then go from there.

[MaSnaka]

Call Stewart Werner tech support. They can walk you through a diagnosis.
915-593-1965 ext. 154
Good luck, John

[Tom of VA]

Sometimes you may need a MSD tach adapter. I also needed a capacitor to run my tach. Call MSD there tech support is very good.