561r/457gw on 2005 silverado

I need some help on the installation of the 561r and 457gw units in a 2005 silverado. I've already got the wiring diagrams from numerous companies. I am wanting to use the unit with the factory key faub using the pulse at the factory actuator ( Since there really are no things as inexpensive models on the GM's anymore.) questions i have are the

1.  On the 457 gw unit what all wires need to be connected including the 3 pin harness, other than power, ground, and violet to the vehicle?

2. And on the 561 r unit what else would cause a diagnostics 6 code (+/- shutdown) to be thrown, I have the following wires connected

T-Harness to hook up all 6 heavy gauge wires

white parking light output - BCM pin

Black to chasis Ground  -

violet/white to tach  at the A5 pin behind gauges

Brown brake wire to white pin above brake

grey hood pin showing ground

BLACK/ white nuetral safety shutdown showing ground

All the while getting #6 diagnostic codes with no attempt from unit to start the vehicle. I have searched the forums on problems like mine but nothing similar a few that were close.  Any help would be greatly appreciated thanks in advance.

I appreciate the insight i thought it would be something ignorant and that i have overlooked i will be checking that in the morning thanks for the help and i will post back if my ignorance is blissful today.   As Carlos Mencia says, "dee dee-dee"

Thanks again