Before bolting the left fuel tank to the spar, I have to wire the gage. I first used a well documented method to label the wires i.e print the label on the computer and the install it with tranparent heatshrink. I tried printing on the heatshrink but the result doesn't seem very durable.
I then bolted the tank to the spar, albeit only half the screws were accessible as I have to take the wing out of the cradle for the other half.