Well at least 2 of them are not. The empty and full lights work which leaves the non working Low and Mid lights non functional. Was like this when I purchased the boat and assumed the sender was at fault. Oddly enough the front unit is almost the same except the Mid light does work along with empty and full. Pulled the sender and cleaned them, no change. Ordered new sender and installed, no change! Will break out the volt meter and do some testing like I should have done first time around. Just wondering if others have had this issue. I am thinking the low and mid lights are the one that technically should be lit most of the time so maybe the LED's are toast? Are they led bulbs?