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Discussion Starter #1
My tach is dead, car as a MSD 6al installed.

I removed the 3 wires behind the tach , i am getting 12 volts, ground.

How can i test the signal coming from the MSD, put my test light and its always on , while car is idling.

thanks
 

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Re: how to test tach wiring with 6al

Erick im not sure but you do have the green tack wire plugged in to the side of MSD box.
 

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Some tachs don't work with MSD and need an adapter. MSD should have something in the instruction manual or on-line on what Mfg's work and/or don't.
 

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Discussion Starter #6
Some tachs don't work with MSD and need an adapter. MSD should have something in the instruction manual or on-line on what Mfg's work and/or don't.
thanks, but i am aware of installation instructions...problem is i purchased a decfective voltage regulator and the volts spiked to 16V... thus burning a few electricals in the car.

I am trying to figure out if the tach is burned or the MSD.
 

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To test the MSD there are instructions on that too.

Turn the key and ground to white wire ... look for a spark (I think thats what it is, I'll have to look) But that won't help on the tach side of it Sorry.
 
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