Hi, welcome to Just Answer
Ok I can not get you the wire colors for the speedo. What I show from my diagrams and stuff is that it is wired from the VSS variable speed sensor to the guage and not through the PCM. I would follow the variable speed sensor. I am not sure but I believe it is at the back of then transimission or the rear axle. Either way these wires should be the same color as the speedo. I included the basic info for installing the speedo and the cluster.
REMOVAL & INSTALLATION
See Figure 1
Remove the instrument cluster, then the bezel.
Unscrew the instrument from the cluster.
Carefully remove the instrument from the front of the cluster.
Install the speedometer.
Install the instrument cluster.
See Figures 3, 4, 5 and 6
Disconnect the negative battery cable.
Fig. 3: Exploded view of the instrument cluster bezel mounting-1994-96 Pick-ups
Fig. 4: Remove the cigar lighter from behind the cluster bezel
Remove the cluster bezel as follows:
Remove the cup holder and ash receiver.
Carefully pry the bezel away from the instrument panel to disengage the clips.
Unplug the cigar lighter and auxiliary power outlet connectors.
Remove the knee blocker.
Fig. 5: Remove and install the PRND21 cable (if applicable) as shown
Pull the PRND21 cable and twist to remove from the position arm, if applicable.
Fig. 6: Unscrew the instrument cluster from the mounting points indicated
Push the tab on the bottom of the cable retainer up, then squeeze the sides to remove the retainer from the column.
Remove the four screws that hold the cluster.
Pull the cluster rearward and unplug the two electrical connectors.
Remove the cluster.
Install the cluster in its mounted position.
If applicable, properly install the PRND21 cable.
Install the knee blocker.
Install the cluster bezel as follows:
Plug in the disconnected wiring.
Carefully maneuver the cluster into its mounted position.
Install the cigar lighter and auxiliary power outlet connectors.
Connect the negative battery cable.
hope this helps__________________PLEASE CLICK ON "ACCEPT" IF I WAS HELPFUL-OR IF YOU NEED FURTHER ASSISTANCE JUST ASK, THANKS
yes it shows right away at the top of list that I opt-ed out and then they will look at it and see if they want to answer
ther eis a few here who might know
If not I will try to get a wiring diagram tommorow or Friday Morn and post it here.