Best not visit any car dealership...
And you can have variable GPH if you so wish
This /\ /\
Run a relay, not hot wired. Mine is on a toggle but the key is ok. If you run the key you ideally want it so it only has power in the run position, not the start.
A dead headed system with a weak pump is ok but a return line system is much better.
I like Aeromotive pumps the best. I have the A1000. I'm also a fan of the new holley pumps.