10-18-2011, 12:02 PM
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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KHBock:
The tach dropping to "0" is indicative of an intermitant electrical open circuit in the primary side of the ignition system IE: bad module in distributor or its connections, coil or its primary connections, or power leads and switched 12 volt circuit to the Ignition Box.
Recently I had a tachometer fail. I sent it for repair and the circuit board had failed, perhaps vibration or it was just "Time to go". Ignition still was working well.
If you haven't already, suggest you mount the MSD box on the rubber Isolatord to help eliminate vibration:
Vibration Mounts, MSD 6 Series - 8823
Trouble-Shooting - MSD Ignition Tech Support Forums
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 10-18-2011 at 12:15 PM..
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