Well I'm not familiar with that setup, but I would think that it's connected to the tach, sounds like it's a safety deal so you can't throw it in reverse at high RPM's??, I'd give it a try and see what it does, can't hurt anything!.. BTW, make sure you have a "direct" 12 volt feed to the HEI, use 12 guage wire minimum and if you have to have a long wire use 10 guage!....