I inherited the gauges in the truck when I purchased it. Both the Boost and Pyrometer are AutoMeter brand. The wiring is OK, not necessarily something I would deem "Professional", but it functions none the less. The Boost gauge functions properly and reads correctly. The Pyrometer, on the other hand, does not. I have checked, and re checked everything to ensure a proper install. It is all in place. The pervious owner claims it functioned fine beforehand, but thats just a "He said, She said" at this point. I have read where the length of the probe wiring is critical to acurate readings. With that, I am unsure if the probe wiring has been done correctly. The wire coming directly from the probe is quite long, but coiled up on the chassis and linked into a seperate wire that runs through the firewall. Is that normal? I have also contacted Autometer to ensure the proper wiring of the gauge itself...so thats good. One more item would be the probe itself. I know it needs to be a certain length inside of the pipe.....I have no idea what that is. Also, how do I test signal from the probe to ensure it is even working? Any help is appreciated!!!!!!