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i have an 06 and im having the same problems.speedo dont work ,reverse lights stay on,limp mode and code po61c.i have the bama tune.thought i messed the pcm up some how.tried reflashing tune with no luck so i put the auto tune back on and speedo works (just doesnt read correctly since its running from a manual ),reverse lights stayed off and no more po61c..of course im getting every code possible for a missing auto.and will get a wrench if i dont turn off the traction control.
I had the same problem till i when ahead and got a PCM for a manual and everything worked just fine (i also had to jump the clutch pedal start) even my cruise control works, but as for your reverse lights, you have two options. you have buy a manual wiring harness, or use your old auto like i did and run wire from your reverse light switch to your power and you lights and do some splicing and jumping, nothing to had, just use quality stuff so you dont have issues down the road. the swap i followed which is the main post that pops up for all this was great but missed a few things, like you have to use a manual PCM, the nuts to mount the shiftier, you have to by the stock shiftier then get a short throw, and some trim piece for the shift boot. other then that its a great manual.