Thanks for comment. Is the sending unit the traditional kind with a
float and variable resistor? If this is so a reading near EMPTY would
make sense if the float were sinking. Otherwise I suppose the float
could be hung up or there is a problem with the resistor. Does the
computer have a direct link to the gauge, or do they share the signal?
Apologies for all the questions, i'm just trying to understand how it
works. I'll try to find a shop manual and look for a diagram.