[vettestr]

OK....
If you simply want a master battery disconnect switch the one you listed from Summit will work fine. Look at their PDF file on the link you included to see how easy to install.

There are many ways to skin a cat and just as many ways to wire your car. All the talk about the alt. is because some will keep running when the key is turned off. If this is not happening and/or reason for the battery disconnect we can move on. You are not trying to solve any issues or comply with some track rules and everything is working so again life is good.

All you want is ability to remove battery from system as safety and a convenience thing, right? If you buy the remote sw. from Summit here is how to install. Remove ground cable from battery - this is to kill everything so you can work on it safely. Remove battery cable from battery side at the starter solenoid and place on NEW DEVICE (voltage in lug). Install a new (high quality) battery cable from NEW DEVICE on the other lug and place other end on Starter Solenoid (this is where you removed the cable from moments ago). The kit shows a toggle on/off switch that comes with the kit I think, mount the switch where you want and run wires as shown in PDF. You should be done after putting Negative cable back on and testing everything.

Other things can be added or removed from the circuit but this is the BASIC install and
SHOULD remove power to everything if wired like I think. You could place the NEW DEVICE right at the battery if you need to because it is a remote controlled device. Any more questions give me a call.
Jeff C 602 402 8504