Hi Stuart
Ideally you should use a suppressed Ignition wire when using an inductive pick up timing light. Unsuppressed wires can mess up sending a signal to the timing light.
Older timing lights actually plugged in line in of the plug wire so not being a suppressed wire was no issue.
As for the battery. You could use the one battery in the Iltis. Or a spare battery. It dose not need to be a full size battery a motorcycle battery or even a battery from a emergency light will work. The timing light draws very little.
The remote push button is a good idea. I use mine all the time for bumping the engine over when doing work on it.
Matthew
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