RR, be VERY cautious in connecting ANYTHING to the hot side of an ignition coil. Even low-voltage devices will often function exactly like a rev-limiter. Can't tell you how many 'almost-stock' Panteras with the 'won't rev over 4500 rpms' syndrome I've seen. Usually it's someone that hooked their Holley carb's electric choke to the + side of the coil, or a car alarm.
With the unplated contacts in Lucas-sourced wiring in a DeTomaso Pantera, it's always best to attach extra devices to the + post on a stock alternator, or run a completely separate hot wire off the fuse panel back to the engine compartment, and use that as the source of any needed electrical power back there. Good luck.
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