Tach for 70 AMX

[Todd Tomason <jayscore@xxxxxxxxxxxxx>]

I've been working with an electrical engineer that designs and manufactures 
replacement circuit boards for tachs.  He's been doing mainly Mopar so far, 
but is trying to branch out.  I sent him a Tic-Toc-Tach for a 71-74 
Javelin/AMX to take a look at, and he found out that it uses the same board 
and clock module as the Mopars.  His website is 
http://www.realtimeengineering.com/, but he hasn't added the AMC info yet.  

Someone sent him a tach for a 70 AMX and he's trying to figure out how it's 
connected to the car.  He said after looking at it that it might connect in 
series with the coil.  Is anyone familiar with these?  I'd like to get him 
pointed in the right direction.  A wiring diagram would also be helpful.

Thanks,

Todd