Tach Signal Dodge Intrepid

I am installing a audivox prestige keyless entry and remote start unit in my 1995 Dodge Intrepid. I have it completed except for the tach wire. I have tried every wire that people on here have told me to check and none of them work.  It has a V-6, coil pack has a 4 wire connector on it with a red, black, white and GREEN/ orange wire. I have tried evryone of these wires with no luck. I tried the WHITE/ black at the pcm in the passenger kick panel with no luck. I tried the different colored wire at the injectors with no luck. where else should I check? the remote start is setup for tach signal, should I try switching it to voltage? what wire should I use if I switch it to voltage signal?

Thanks