Can I still use the - terminal on my coil to run the tack. Using the super mag III with external coil.
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I would say no being that the voltage is not constant like it is on a standard distributor.
Call Autometer's tech line. I think their part # 9117 tach interface is what you need. I'm using one with an internal coil vertex, but the instructions also show how to use it with an external coil mag. I had trouble with the tach freaking out at high RPM due to solid core plug wires. I swapped to suppression wires and it seems to have fixed it. Won't know for sure until we can deck the throttle and see what it does at high RPM. Hope this helps and good luck.
Make sure you wire it exactly like they show in the directions, With the trigger wire & the ground trigger wire on each side of the mag kill switch.
We still haven't had a chance to run the boat all out and prove the tach works throughout the RPM range. We are scheduled to test soon, certainly before Bakersfield. Also we're trying to make CFW next week, but my work schedule is kinda insane right now so not sure we'll be able to work that out. Good luck.
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Hope you get it figured out.
Ours didn't work properly with solid core wires. We had to change them.. I'd try it with what you have and see what happens. Good luck, hope it works out for you.