O2 Sensor Wiring Key
Our wideband wire loom consisted of six wires with an additional two terminal jacks. The two terminal jacks will be plugged into the back of the GTech tach later on.
Red For 12V power source...
| Red | For 12V power source (with 5A fuse) |
| Blue | Must be grounded |
| White | Must be grounded |
| Yellow | Will not be used |
| Brown | Will not be used |
| Black | Will not be used |
Following the wiring key,...
Following the wiring key, we went ahead and took a trip to the local auto parts store, where we picked up a 5A fuse. With the fuse, we connected the red power wire from the GTech to a 12V ignition power source we found under the dash.
The blue and white wires were...
The blue and white wires were grounded to an additional wire that had already been grounded to the chassis under the dash. We used a splicer connector to get the job done without damaging the original wiring. The splicer gives us the ability to tie two wires into one.
RPM Signal Wiring Key
Our rpm signal wiring consisted of five more wires. However, only four are used and the opposite end has a USB style connector which will connect to the back of the GTech tach.
| Black (thin) | Must be grounded | Red | For 12V power source |
| Black | Must be grounded | Green | For tach signal |
| Orange | Only used for demo versions, so it must be grounded in normal operations |
We started with the green...
We started with the green wire and connected it to the coil. This wire communicates with the tachometer, telling us the rpm. We ran the wire across the firewall and again through the grommet and placed it underneath the dash.
The additional red wire must...
The additional red wire must be powered to another 12V power source under the dash. The rest of the wires (both black wires and the orange) must find another ground source. Obviously, we found the most solid ground we could under the dash with a bolt through the firewall.
We then plugged in the USB-style...
We then plugged in the USB-style connector into the back of the GTech tach.