I've got a J-Type in my PV. And I just took out the cigarette lighter and put a matching old Volvo switch in it's place. No relays, just 12 volts to the switch and through on to the 4th gear switch on the trans. Only slight problem is that is isn't self cancelling - every once in a while I'll leave it on and get a 3rd-to-OD shift. I think you'd have to get a little clever with the wiring of a bi-stable relay and that 4th-gear switch to get that setup to be self cancelling though.
I'm already using the turn signal pull-back switch to dim the headlights - I replaced that wretched floor dimmer switch with a 140 relay.
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I'm JohnMc, and I approved this message.
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