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Re: 3 speed overdrive with an HEI distributor
You're welcome!
About the only other option I can think of would be to interrupt the signal from the HEI pick-up coil to the module. That could also be done with a relay. However, the pick-up coil wires are located inside the distributor, and there isn't room in there for a relay. So tapping into that circuit would probably involve drilling a hole in the distributor housing, inserting a grommet, an running wires to a relay mounted nearby.
Since this would be interrupting a relatively "low level" signal input to the module, I would think it would have a low probability of damaging the module. But it might have the potential to introduce noise/interference that could result in misfires. Although using a quality relay, terminals, etc. and keeping the added wire length relatively short (and away from the spark plug wires) should minimize the chances of that happening.
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