Before Calibrating scales, please have the people check the weight on all four diagonal corners and centre, making sure its a similar weight (will not be exact) in every spot. If it is not similra weight there is no point calibrating, as it is more than likely a load cell, and calibration will only cause other issues. (Speak to Rob or Chris if this happens).
If the scales are not recording the correct weight they will need to be calibrated
Your scales should now be weighing correctly. The TSi will remember the load bars through the resister in the plug