Autogauge Tach

Something new happened today. The car was sitting in my driveway running and it died, turned over but no start. It didn't have the tach wire on the coil at the time. Replaced the FBO ecu with my spare orange box I keep in my trunk and starts right up and idles fine.

So I guess the tach is ok but my ignition box is toast. Don't know what to do now. The car idled a lot better with the FBO box over the orange Mopar box. I just want to plug in a new box and not splice wires.My only choices are to go with a Mopar chrome or the new FBO. Not really wanting to go with the FBO now with this failure. Are the new FBO boxes better or the same as the Mopar chrome? Thanks to all for your help.