[speedjunkie]

This is what Charles said...

Eric,
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I personally use 14g wire inside the pump assemblies. It might be able to handle larger but I don’t see much point.
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Up to the hanger perhaps go a little larger. Most RX7s seem to have the battery in the hatch, making it really easy to wire up. Use the stock fuel pump power and ground to activate a relay for your new pumps. Or perhaps use stock wiring for one pump, and splice off that wiring to trigger a relay for the secondary pump if you want it on full time. But if you have any programmable outputs, I would trigger the secondary pump around 2psi of boost.
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Note that since the connectors only have 6 terminal positions, that if you want to keep the fuel thermistor (which I believe the rx7 uses for the low level warning light), you have to sensor ground through the chassis of the pump housing. Anodizing blocks electrical conductivity so to use the chassis you have to make a path for the electricity by strategically removing some anodizing under hardware. We did this in our RX7 and ran a small ground strap from one of the 8 mounting bolts