[Gaz64]

Wayne,

I'm not sure on your application since I haven't experimented with external regs.

All of my cars run internal regs, my current Datsun project car is external reg but will be converted to internal reg.

The relay I operated via the alternator warning lamp wire was my design some 15 years ago
when I told one of my pesky neighbours I was going to make my car start remotely.

The look on his face was priceless.

Even had neutral safety as stick shift gearbox via the neutral switch.

And handbrake cutout if somebody else thought they could drive it off.