need programming viper 160xv

Here is the situation, I received a Viper 160xv from my mother-in-law that was in her malibu. I have a 1990 Jeep Cherokee that had a old avital car starter in it when I bought the truck last year, but never got the remotes with it. After some tracing of wires I had to modify two of the harnesses to make the system to function in the Jeep. All the safety stops are functioning correctly, I can lock and unlock the doors. The problem lies in the remote start. It will crank for only 1.5 secs. It will try this three times and then I can do it again. The truck needs to crank longer since it is a old beast. I cannot get the system to relearn the Tach Signal or get in the second menu to increase the crank time. I have tested the AC voltage on the tach wire and it is Ok. I have also ohm'ed out the valet switch to make sure that is Ok. I cannot get the unit to program for the life of me following the install manual. please provide some tips or tricks. I have also contacted the install facility that installed it in the original car and it is not locked with Bitlocker.

I've been searching all day for the remote valet switch button on the same system installed in my 2005 Expedition. Trying to program new remotes and took most of the lower dash and kick panels off trying to find it.

I'm confused, are you guys brothers? To relearn tach, once u find the valet switch, start car and within five seconds press and hold valet switch if the red led illuminates you have been successful if not you need to start re-checking.