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Joe--- pump gear ratio determines how fast the pump is turning you don't need crazy RPMS I think the absolute pump max should turn like 57% of engine speed usually lots lower than that probably like 1/3 of engine speed and usually there is an adjustment on the pump to increase or decrease the pressure--- you only need so much to make it work and since the pump is belt driven we are talking HORSEPOWER here maybe as much as 15HP if ya got it all wrong. You definitely need to talk around see what these pump guys recommend. Just remember that the oil gets sucked out of the pan into the tank and then along with the help of gravity feed gets sucked out of the tank thru a little bitty hose to the pump to be dispersed thru out the engine ---That sucking/pumping takes a lot of power (horsepower) to run the pump. I'll bet you could get away with maybe around 30 pounds pressure to lube your engine ya really don't need 70-100 pounds. It'll be high when the oil is cold but as it warms up it'll come down to where you want it.---Just remember pressure and volume are not the same thing you can have lots pressure and very little oil actually moving thru the system conversely you can have lots volume and very little pressure. You need to have everything sized correctly( Hoses/ fittings/Bends in the hose etc)