[ndutton]

It depends on what the remote switch is used for. If it's intended to rotate the engine only as in the case of valve adjustment, you don't want the ignition on (no start, just rotate - also the intended use in the instructions). If you want to start and run the engine via this remote switch as Dave Neptune does, energizing off the ignition circuit works provided the circuit wire gauge is sufficient for the added solenoid load which - according to the diagram Mary followed in her rewire - it is not.

As for connecting to the big starter post for the power supply to the remote switch and the possibility of draining a battery over time, that post should be de-energized by the battery switch. I'm not certain but I expect the draw from the indicator light is so low as to be insignificant over a daysail or weekend.

I'll reinforce the caution by others about leaving the ignition on without the engine running. An excellent preventative for this is the oil and temp alarm system. With the ignition on and the engine not running a buzzer sounds to remind you, a side benefit beyond what's intended. It's the gift that keeps on givin'.