Hi I'm very new to this so bear with me lol. I'm trying to plan out a project for building a diesel powered car and I want to use an of the shelf pneumatic starter for novelty but I don't know how much volume I need. So the starter requires 120 psi @500scfm. My idea is to use scuba tanks or aerospace gas accumulator spheres which are rated at 3000 or more psi and regulate that down to what I need as far as pressure. From what I understand those starters can have either 3/4" or 1" inlets ( I don't know if that matters) that's pretty much as far as I got before I realized I need help. Any help would be much appreciated thanks!