The rev counter/fuel display is made by VDO, it seems to be based on their Ocean Link Range. Installation instructions are here: http://www.mechanikadc.cz/wp-content/uploads/2014/05/MI-Dzm-CAN-Master-EasyLink-GB.pdf and whilst you can select fuel level display and calibrate it from a button on the front of gauge it would unfortunately seem that the M3W version is probably preprogrammed and calibrated to suit the 240mm tube sender.
