Ok, so after reading the HSW page on relays, i think i get it.
I use a relay on each positive wire on the fan, connecting the electromagnet part to the fuel pump. This will allow the fuel pump to send a tiny bit of electricity to my relay, telling my fans to turn on. I then hardwire the relay to a power source (i assume i can just wire it straight to the battery) and ground it at a common engine ground.
right?
EDIT
i drew a pretty picture
