66 Dart GT HT Whatsitgonnabe?

Well look what I got!

2016-10-07 11.50.18.jpg

It's a Pro-Comp 6602 designed to work with Vertex AOC magnetos. Now, I don't have a magneto on my car but I figure it really couldn't be all that hard to adapt the signal.

It was a bargain at $65 or so (list price in the US roughly $310 but it isn't sold any longer) so I just had to have it.

Does anyone have specific knowledge of what the input on one of these tachs looks like, electrically?

Before you start googling, I've done a lot of that already.