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I bought the TruSpeed speedo calibrator for my 2006 4x4 DC. I got the wiring diagrams for the combination meter from Mustang on this forum (works for Toyota). The install was easy and the calibrator seemed to work, but it fluctuates wildly at random times. Some days when I drive to work it is 10 mph fast, and other days it is 10 mph slow. I have a gps that I use to keep track of my speed so I can tell when it is off.

I called Superlift and ordered a replacement, which I installed but it had the same issues. I'm about to send the unit back but I wanted to see if anyone had any suggestions or whether anyone had encountered the same problems. I am guessing it has something to do with the speedo signal and the combination meter on the 2006 models, but I don't know enough to know why.
 
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