Southerngypsy has the same idea as me. I have these on the dash of Bagusjeep and Puthijeep near the ignition with the key wired to the key ring. When I am away from the vehicle I know all power is disconnected and can leave it for weeks if need be, no electrical fires and no discharged batteries. If you want to preserve the radio memory you can wire around it through a small fuse direct to the radio.
It needs a new set of cables from battery to switch and from switch to solenoid but there is enough space behind the dash to get it in.
Gladys will be getting the same arrangement in a few weeks.
I would not recomemnd this if you have a winch, the switches I use would not be rated high enough.
BagusJeep lives in Bali, the Land of Temples.
With a Jeep every prayer counts.
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys