tb42 auto stuck in 3rd and takes ages to select reverse
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It sounds like you have a few electrical issues. The tacho gets its feed from your alternator generally and what you describe is happening with your auto sounds electrical too. A thorough going over of all wiring and connections may solve this, could even be an earth missing or damaged. I would have a good look at this first before forking out money for another box it could be a very simple fix.