I mounted mine using a hole that was already in the frame to bolt the bracket to, hard plumbed to the metal tubing rather than using the short rubber hoses and spring clamps that come with the pump, no insulation of the pump body from the bracket or frame. Just reverse the wire to ground the positive and run the negative through the dashboard switch. (Have an inertia kill switch to shut down in a collision.)
P.S. Unless you are just going to turn the pump on momentarily to prime the mechanical pump when vapor locked you'll need a pressure regulator as the pump will put out the maximum 4 psi which is too much for the carb float valve. I put the Holley pressure regulator between the electric and the mechanical pump. Even so, I had to adjust the regulator clear out to get the pressure low enough to not overwhelm my carb float valve.
