RBM, thank you for taking the time to reply. Comparing my relay to the neutral function schematic, I can see that you are right. I need the three separate 'gear position switch' grounds to energize three relays minimum, to complete the circuit. (Not knowing the inner workings of the 'gear position switch', if I could use only one of the grounds, I could use just one relay).
I'm assuming there is a triple ground redundancy to ensure that there isn't an accidental starting while in gear.
Thank you for weighing in on the MSD GMR pickup. It appears to require an rpm pulse per revolution setting of "1". The Trail Techs seem to provide a .5, 1 and 2 PPR.
RBM, do you have any of your 'start in neutral' circuits available to buy?