In looking at the MegaManual info on unipolar stepper motor coils, it would appear that I can wire both coil center taps to the ignition coil B+ and connect the 4 wires from the ECU to the coil ends as shown in the MS diagram:

pin 1 = Coil 1, lead A
pin 2 = B+
pin 3 = Coil 1, lead B
pin 4 = Coil 2, lead A
pin 5 = B+
pin 6 = Coil 2, lead B

MegaManual page

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum