hi,
Good to hear that the LM3914 section working ok.
Measure these voltage points, let me know.
#1, Junction of the two 470R that feed the tank sensor [vr]
[ should be approx +4v]
Yes, it reads +4v
#2, Junction of the 470R and the tank sensor [vs]
[should be from 70mV thru 770mV, from full to empty]
Readings are only at 14mV @ full and 26mV @ empty
Note that R2 [10k] from the sensor is connected to pin #3 of the 1st OPA
Yes it is connected that way.
EDIT: make sure that R5 [4k7] on pin #2 of the 1st OPA is connected to 0V
Yes it is connected that way too.