I'm installing an MSD-AL and am wondering how to drive the tachometer. I don't have a Pantera wiring diagram. Where can you get one? I also installed an MSD distributor, so its magnetic pickup plugs directly into the MSD Box. The MSD Box has a tach connection that the literature says is a 12v square wave w/20% duty cycle. Is this the proper form to drive the Pantera tach? I've seen previous posts at this site that the Pantera tach is voltage triggered. If this is so, I would expect the tach is triggered off the negative side of the coil secondary. On my car, two dark blue wires in the same spade were connected to the negative terminal of the coil secondary. Are these two wires the tach trigger? Since the MSD box powers up the coil secondaries with separate wires, can these two blue wires (connected to the neg of the coil secondary on the stock configuration) just be connected to the tach output on the MSD Box?
I have the MSD voltage triggered tach adapter, but it appears that this approach is only used when not using a magnetic pickup such as on the MSD distributor. I guess I could experiment but don't want to smoke my tach. Anybody out there done this job taht could shed a littel light on driving the Pantera's tach??
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