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White wire...tachometer input....!
Frankym...I have an MSD6AL on my Superformance. The white wire from the control unit is your tachometer feed. Connect this wire to your tach to provide input.
So far as your problems are concerned, I've had no problems with mine, so far anyway, in over 2000 miles. Starts readily, effectively limits RPM to the value on the crystal, etc. Mine is mounted on top of the passenger footwell inside the engine bay. The box is isolated with rubber vibration dampers, and heat has not been no problem so far.
I am suspect of the backfire and vibration you talked about with your original dual point set up. Have you remedied those problems yet? Simply replacing your ignition with an MSD unit won't correct those problems (in my opinion), and may be the root cause of your problems with the MSD box.
MSD6AL's are run by the NASCAR teams and believe me, if there was something wrong with them, they'd be out on their ear. Doesn't seem to be the case.
Good luck...but, I'd suspect your problem doesn't originate with MSD. Keep looking and let us know what turns up.
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Flyin_Freddie
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