Quote Originally Posted by hmm252000 View Post
One suggestion. Have you thought about grounding your RPM relay through the inertia switch? That way you restore a critical safety feature but don't have much of a load going through that switch as well. Basically if you are in an accident, the inertia switch trips and kills ground to the RPM relay. The relay should then shutoff and kill power to the pump.

I don't have my schematic in front of me, but you might even be able to utilize the old fuel pump wiring. Connect the two old pump leads together so now the wire running back to the RPM relay is grounded via the inertia switch. Reconnect the wire to the RPM relay but on the ground terminal instead. This is assuming nothing else is connected to the pump power lead which I can't verify at this moment.
I've thought of the same thing. You would probably need to have a pullup on the RPM relay ground pin so the ground pin would not float if the inertia switch opened. I would try a 1 meg ohm pull up from the RPM power pin to the ground pin. If that works it would only have about a 100 ua. drain on the battery. I would have tried this but then you need to run a wire back to the relay or move the inertia switch to the relay compartment.

Another option is the switch can turn of the key on signal into the RPM relay.