Now you need 2 of these from saturn 22692904
Now push it into hole 31 until it clicks
Re-secure the harness with a zip tie
Now the bottom PCM connector number 3 only has one blue plug in number 10 slot thats your next pin (same things as the top connector, make sure to remove the pin lock slider out of the side)
Now install the black covers
Now connect your black wire from the firewall to the BOTTOM Pcm connector wire. Then connect the TOP Pcm wire to the white wire from the firewall. Apply loom as needed and run wires to make it look nice and clean. (you see the new wires? look closely at the bottom of the connectors.
Now for the Gauge.
Cut Off BOTH connectors then wire the 2 pink wires together and the two grey wires together
Now wire the solid black wire and the Black wire with a white strip together (they are grounds) Then put a connector on the brown wire and the white wire.
Now run a ground wire to the bolt next to the radio, and then run a wire and tap into the WHITE wire on the hazard switch like so
Now use a "add a" fuse to the 12v fuse on the fuse panel. I didnt have one
Then run that new wire up to the steering column with the other power and ground wires from the radio hazard switch area.
see the new wires dangling in the left of the picture
Now take the power wire from the hazard switch and connect it with the 2 grey wires from the gauge. Then Take the power wire from the fuse panel and connect it with the 2 Pink wires at the gauge and Now take the black wire from the radio area and connect it with the two black wires at the gauge.
Now the Top PCM wire which should be white goes to the WHITE wire on the gauge assembly. Then the black wire from the bottom PCM connector goes to the BROWN wire on the gauge assembly.
Now pop the gauge in place and re-install all panels. Turn the key to the run position don't start the car, and hold the center button on the back of the gauge assembly till the lights flash. Now cut the ign. off and then start the car. The lights should do a light check sequence and the gauge should spring to life.
I really hope this helps. Check with your local tunner and see if unplugging the PCM will require you to re-tune. I dont think it will but beter safe then sorry. I am on a GM stage 2 tune and had no problems.
DISCLAIMER : Once again I am not responsible for the mods you do to your vehicle.