Megasquirt 2 hei distributor wiring diagram

The 7 Pin HEI Module. With a GM HEI 7-pin (and 8-pin modules), the ignition module wires you need to know about are: tach signal is a purple wire with a white trace [pin R] goes to Ampseal OPTOIN+

pin #30 (ground the Ampseal OPTOIN- pin #31 at the distributor) ; advance control signal is a white wire [pin E] goes to Ampseal pin #12; override (cranking) signal is a tan wire with a black trace Fuel calculations for the MegaSquirt-II algorithm are performed in the HCS12 processor (such as fuel, ignition, and anything else requiring math calculations).

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