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‘70 Factory Tach
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Someassemblyrqd View Drop Down
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Points: 458 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Someassemblyrqd Quote  Post ReplyReply Direct Link To This Post Topic: ‘70 Factory Tach
    Posted: Sep/19/2018 at 9:44pm
Will the factory ‘70 8K tach current trigger function with full 12v ? Running a MSD 8523 Ready to Run Distr. which requires full 12v to operate correctly?

If not, what does the tach operate at, could a ballast resistor be integrated into the yellow wire off the 12v coil to lower the voltage read?

Currently, I planning on running 12v feed to the “I” terminal of the solenoid and then down to the +side of the coil. I would think I’d need a ballast resistor from the “I”terminal between the 12v and blue tach wire.

Thoughts?
Greg E.
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BDCVG View Drop Down
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Points: 993 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BDCVG Quote  Post ReplyReply Direct Link To This Post Posted: Sep/19/2018 at 10:47pm
MSD makes a tach adapter that will run it correctly.
1970 AMX 390 5 spd full Control Freaks front and rear suspension
2014 E63 AMG-S wagon
1965 Austin-Healey 3000 MK III              
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Someassemblyrqd View Drop Down
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Points: 458 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Someassemblyrqd Quote  Post ReplyReply Direct Link To This Post Posted: Sep/20/2018 at 8:27pm
There is no tach adapter for the 8523 ready to run distr. I’d have add on the MSD ignition box and then buy the tach adapter.

Will wait for additional inputs from Forum members. Thx. Greg
Greg E.
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Greyhounds_AMX View Drop Down
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Points: 1268 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Greyhounds_AMX Quote  Post ReplyReply Direct Link To This Post Posted: Sep/22/2018 at 5:55pm
It has the standard MSD 12v square wave tach signal on the gray wire. The 8920 tach adapter will take that signal and drive your tach.
1968 AMX 390 w/T5
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