Okay, I am leaning towards the replacement of the cigar lighter with a rotary switch. So while I am at it, why not make it a secret kill switch too. (oh rats, the secret is already out).
Position 1 would interrupt the ignition circuit. It wouldn't matter if the circuit for the OD was on or off since the car won't run. Position two would complete the circuit for the ignition but not the OD, position 3 would complete both.
Or maybe a rotary/push/pull. So I could push/pull the OD (or ignition) and rotate the other.
I think a pull to complete the ignition circuit and then a rotary for the OD (manual/auto) would be awesome. When I parked the car I could push the switch in and everything would appear 'normal'. I wonder if I could adapt a headlight switch to work.
If any of you guys have an idea let me know. I know it is dumb I am excited by this but for some strange reason I am.