I finished installing all the screws on the left tank and put the wing back in the cradle.

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.

Both fules tanks are now again on the spar. The right one definitively and it takes some time to torque the 21 bolts abd 80 or so screws.
The left tank will have to come off once more as I still have to wire the gauge and don't have the wire available.

As the tanks are of the wings, I primed the rear baffle and the side ribs.

The second tank is considered leak-free.