Twitchy Tach

[Mr. Land Yacht]

Does anyone know what would cause my Tach to do this?

http://www.supermotors.net/vehicles/registry/media/640508

I'm guessing a loose ground wire but I had read somewhere that if you wire the Tach into the MSD box(which I have one) that this can cause problems with the Tach. My uncle says that he did wire the Tach into the MSD box when putting it together...so I'm guessing this could be the problem..yes/no?

[gadget73]

Looks like a bad connection. Plugging it into the msd shouldn't hurt anything, but if the connection isn't good it'll flutter around.

[torquelover]

Did he use the tach output or the coil output on the MSD? Do you still have all your gauges grounded at one location? If so, ground the tach directly to a known good ground.

[Mr. Land Yacht]

Here's the source of the Twitchy tach...it's getting so twitchy it looks like a propeller.


should I just ground this wire to ay good spot or should I ground it with the coil?

[gadget73]

Thats not the ground wire. Thats the tach output wire. The ground on the tach is the black lead.

[Mr. Land Yacht]

oh yea.

I guess I could just splice it onto the coil wire like my old one was right?
any other wires I can tap into with it? there are some coming off the disty.

[gadget73]

You can, but it probably won't fix it if the ground wire is the problem.