billwill wrote:When I said wrong end of the resistor, I was not considering direction of current flow, but the position of the sensor arm.
it was said (post 3) that the sensor/resistor cannot be turned upside down - that would go in the good direction, while necessitating float arm bending
billwill wrote:Connecting to the other end would reverse the full/empty resistance characteristics
eg if it was 0 ohms empty and 140 ohms full
it would now be
140 ohms full and 0 ohms empty.
That would require a 3 terminal (potentiometric) coiled resistor (switching from say, bottom/middle to middle/top connections) - I have never seen such a sensor, though it possibly could be modified (but I personally would be reluctant to do it, since it is inside the tank and not pleasant to do again in case the hack fails prematurely)
billwill wrote:Howver since VDO make sensors both ways (see that link I gave above) it is far, far more likely that the OP does not have a matched pair of gauge and sensor. i.e that the supplier sent the wrong bits.
yes, it is my guess as well : the gauge end is where I would look into (making sure the expected impedance for "low fuel" and "high fuel" levels are matched to the sensor).