Stock Tach Wire Location?

Hi Guys, Im posting this question for a friend on the forums here that can't get to the computer right now because he's at work. Anyways...... He has the LM-1 and is trying to hook up the RPM coverter he just got. It says to hook it up to a spark plug wire but he has a 6-AL Box and obviously that's MultiSpark so it wont give him the right reading. He needs to know where the wire that runs to the factory tach is located so he can pick it up there and give him a good reading. Or is there somewhere else/better to hook up a RPM converter for the LM-1? Any help would be appreciated. Thanks in advance!!! :SNSign:

Right, But Innovate says it can't be more than 5 Volts?

Nevrmind guys, he called Innovate. They said any 12 ignition source will work so he will just hook it up to an ignition wire before the box. THANKS!