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RPM Input
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Post RPM Input 
Can you use the MSD box output as the RPM input into the MK3 Pro? (Using FREQ1)

Noob question, I searched expecting to find the answer, but did not.


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1981 Mustang track car
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Hi - what kind of signal does the MSD box output? Is it a clean square wave? If so, you should be able to connect it directly to the RPM input.

If it's a flyback signal from the coil, you may need CoilX:
http://wiki.autosportlabs.com/CoilX

Let us know and we can guide you in the right direction. Thanks!


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Brent Picasso
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Not 100% sure of the signal, it got stupid cold here so I have not got a chance to scope that signal. Was just curious if anyone knew. I will scope it and report back, thanks.


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Most all the MSD box's like a 6AL produce a 12volt square wave signal with a 20% duty cycle for a tach signal. simple answer is, yes.

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