Ammeter to Voltmeter...who does it?

Yep, and the guy who takes credit for that TFI conversion goes by the screen name of JeepHammer. Very long-winded guy. His heart is in the right place, but his info is just outdated and some of it is dead wrong.
OT, but since we're talking about it, there is guy on the carburator forum who kept that coil when going the other way with his Mustang. He got rid of the fuel injection and EEC IV, so he needed a simple ignition system controller. I pestered him to post the details, which he did.
Thread here if your interested: More on E-core coils, TFI and Duraspark.