I doubt he has the provision for a mechanical pump, and if it does and the motor is stock (Otherwise) it would be safe to say there is no lobe on the cam to drive it.
The tanks have a crossover line to help balance them if you overfill one right? I would run a new return line, Y it somewhere and have it dump a little in both tanks. Then you could bypass the switch and not worry about burning it up. Dropping the tanks will be a huge pain and I dont know if they even make a electric pump that makes that low of a pressure. If anything, drop the tanks and take the stock pumps out. Then put the two new ones on the frame somewhere with new filters then if you have anymore problems you wont have to drop the tank to fix the pumps.
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