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.
Seems NOT, because it reads more accurately.
On another note, anybody understand ( maybe OP Richard?) why the word "rack" is in the thread title?
I agree Ken. Have just measured my old original 250mm unit and it reads (as best as I can measure) 3 ohms with float at top of travel, and 70 ohms at bottom of travel. I see no reason why VDO would offer a different max resistance for longer sensors, and would guess the small differences noted by planenut were down to manufacturing tolerances.
The value of fitting the longer sender seems indisputable given the consensus of opinion that it gives the expected higher reading for any given registering fuel level below full.
First post explains thread title query BTW.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone
