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@JoelP , sorry if I made what's pretty simple sound complicated.
In a VW air-cooled motor, there are three basic ways to purposely kill the engine electrically. You choose the way that's most appropriate to what you're trying to accomplish.
A kill switch at the battery cuts off all electrical power to everything in the car. Good if you need to work on anything electrical - it's like pulling the main circuit breaker in your house if you need to work on the wiring.
The ignition coil cutoff (which can be installed close to the driver, under the dash) just keeps the engine from starting when you hit the 'start' position on the ignition switch. The engine will crank but not fire. In theory, this is an anti-theft device (that might outwit some slow-witted or impatient thieves).
The third one I mentioned applies only if you have an electric fuel pump. Original VW's (and 356 Porsches) had mechanical fuel pumps, but many of us remove that and put in an electric pump for a number of reasons.
If this all sounds confusing, you should be able to find an independent auto shop in the DC area that could easily install any of these options and explain how to use them. It wouldn't even have to be a shop that specializes in air-cooled VW's. Any guy with gray hair will know what to do.
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