Tach Signal wire from ECU?

What is the best signal to use for an RPM input to various devices? I am installing a Zeitronics Air/Fuel monitor and it wants a 0-12v Square wave tach signal to monitor RPM.

The 'Busa schematic says there is a Yellow/Blue tach out wire, and additionally a white/blue wire that is the #1 coil primary wire.

Which would be best to tap into? Also, does it degrade the signal if more than one device is tapped into the same wire?


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