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Message: <blockquote data-quote="Tonimus" data-source="post: 29617" data-attributes="member: 12914">Been wanting to add a trans temp gauge to my cluster for a long time. Also had a bulb die behind the speedo. Didn't want to send it out for $300 worth of service when I had everything I needed but parts.<a href="https://flic.kr/p/2soS9tw" target="_blank"><img src="https://live.staticflickr.com/65535/55392715532_b7381b187f_z.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>I picked up a new LED series face on eBay from GM Gauge Repair. Ordered LEDs from another seller, and a 2006 Trailblazer cluster for $30 shipped.Scavenged the steppers, needles, and cluster pigtail from the Trailblazer cluster and scrapped the rest.Before I started.<a href="https://flic.kr/p/2soXC28" target="_blank"><img src="https://live.staticflickr.com/65535/55393783753_40305ef018_z.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>LEDs soldered in.<a href="https://flic.kr/p/2soYYgM" target="_blank"><img src="https://live.staticflickr.com/65535/55394046995_053677131b_z.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>Reinstalled in the Tahoe.<a href="https://flic.kr/p/2soWWsb" target="_blank"><img src="https://live.staticflickr.com/65535/55393650646_2a6dbe01c1_z.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>I was able to use my OBDX Pro VX and the pigtail from the Trailblazer cluster to make a little bench harness to program and test the cluster. On the gauge plug, pins A12 and B12 are ground, A11, B9 and B11 are +12V, and A6 is serial data. OBD2 pinout is Pin 4 and or 5 are +12V, pin 16 is ground, and and pin 2 is J1850 serial data. Hooked all that up to my laptop with IPC Hammer to turn on the trans gauge.All is good. I should've been slightly more careful in putting the needles back on, but I compared it to live data from the OBD2 port and I just need to adjust a tiny little bit. Easy enough to fix and it was caused by my lack of experience doing this. All in all, pretty good for my first GMT800 cluster.I know none of this is new and people have been doing this for ages. But this was pretty easy and if you're handy with the soldering iron, not at all a problem.</blockquote>