im not giving it two signals ... i said if i was to give it the signal from the MSD and not the factory wires. the MSD box only has one tach output, so can i split off of that wire a total of three times and the strength still be ok??? what type of signal is a "tach signal"? like volts or what, does it pulse or stay constant, if i knew these things i could better fix the problem. thanks for the input