Tmac:
Know anything about volt-ohm meters, know how to use one? So, if yes, can you read a schematic electronic print?
I'm asking because, if not, you may have to learn...
I dont have an '07 14 print in front of me, but I'll make an educated guess that these "sender units" are nothing more than glorified (ADOT approved) variable resistors.
There is, generally, two or three wires. There's two if the unit is internally grounded through the sender's metal chassis, and there's three wires if the sender unit needs an external ground.
You're looking for three signals to-from the sender unit: One to ground (if need an external ground), One to battery (some positive battery switched signal, dont get too wrapped around determining where it comes from), and one going to the ECU.
You already plugged / unplugged some of the harness connectors to / from the sender unit to the rest of the cycle.
First thing to try is, find the rest of the interconnects (the sockets / plug pairs) and unplug / plug them too, looking for a loose / dirty / corroded connector. This is where you learn to read the print in the service manual, and figure out where they are located...
The other possibility is a fuse. Wiggle all the fuses in the fuse holder. You're looking for a loose / dirty / corroded connector supplying (or not, in this case) the battery voltage to the sender (and looking for it to be currently (no pun intended) missing in action.
So, crawl over the wiring and connectors for awhile, and try not to break anything.
Also, there's always the local repair shop, open for business...
2012 Blue ZX-14R, Cox rad guard, Skene Design P3 Lighting, Knight Design 1" lowering pegs, Grip Puppies, BrakeAway, Cortech Sport tailbag, GSG MotoTech Frame sliders, Stebel Compact horn.