Re: tachometer (accessory) question

[Don]

OK, never seen one of these….
But, the grey tach lead goes to "signal", purple B+ (switched on power from key switch) goes to "battery", black ground goes to "ground", the purple lead coming off the instrument light would go onto your running light switch or the purple B+ if you want the instrument light to be on whenever the engine is running. I’m sure that "sync" terminal is unused in your application…
Again, have never seen one of these tachs, obviously for the new ETEC engines. Perhaps Will can provide more info….