tach...how to make it work

I can share information also how to get OEM tach work with FAST XFI/XIM unit:

-The crank sensor output wire from XFI connector 30-A3 (brown-white) need to split and connect to the tacho coil -. New aftermarket tachos fill read it directly, put old mopar tachos will need updated inserts. I bought mine from RTE-engineering (http://rt-eng.com/rte/index.php/Main_Page) and after pretty easy installation but little longer calibration it worked fine.

-They also sell electronic voltage limiters which is good update for hemi´s 130A alternator output.