Hi aburley.

This - CIVA INS - THE ONLY THREAD PLEASE - would be the best place to look for the info you need or to ask question about the INS. ;)

As for fueling the 707, start by filling the tank furthest out towards the Center tank.
Examples
75% fuel = Center Tank 41.6%, Left Tank 100%, Right Tank 100%, Left Aux 100%, Right Aux 100%, Left Tip 100%, Right Tip 100% = 119945.3 pounds of fuel.
25% fuel = Center Tank 0%, Left Tank 5.5%, Right Tank 5.5%, Left Aux 100%, Right Aux 100%, Left Tip 100%, Right Tip 100% = 40009.7 pounds of fuel.

Notice that the tanks closest to the center of the 707 have the least amount of fuel starting with the Center tank (at the 25% fuel load, it is empty).

Mark