At the low current those sense wires carry, the voltage drop in a 10 meter run would be less than 1% with a tiny 20 gauge wire. The gauge measures resistance and the resulting voltage drop, through the sensor (which is usually a variable resistive element). Changing the result the gauge sees, at the front of the bus, by less than 1% won't even be visible in the needle movement. So, I guess my point is that I've never tried to compensate for the length and I've not seen senders or gauges with that compensation adjustment (at least not in any affordable versions I've shopped or used). I don't think you'll notice.
EDIT: After hitting post, I saw Booyah's response. He makes a good point about the capillary gauges - I was thinking only of electrical, which is all I've used in our rear engine buses.