i got in there and did some testing with the grey wires and grounds..
there's some weird shit going on up there!
it's really strange, i can get the fuel gauge light to come on my jumping the ground direct to the frame and jumping the grey wire direcly to the blue connector in the fairing.. but only the fuel gauge light..
then, if i jump one of the grey wires from either the speedo or tach directly to the blue connector and the ground to the frame, i can get both the speedo and tach to light up.. but not the fuel gauge..
seems stupid to have run them separate.. i guess if it comes down to it, i'll just end up running a bunch of jump wires and call it a day..