Am I correct in thinking you have the basic 2 digit programmer that came with the speedo? If so try and find someone at your local club with a advanced LCD box, ask them nicely to plug it into your speedo, when connected it will display some numbers followed by 'mod' or 'stock'. Ideally for offroad your looking for 119mod. If it is loaded with a stock software it will get hot running modified motors even with boost/turbo etc turned down (had same issue myself). To change the software you need to connect the speedo to a pc through the setting box and download off speed passion website.
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