The Fermilab Main Injector will be used as an injector of 150 GeV/c protons and antiprotons for the existing Tevatron. Additionally, it will provide 120 GeV/c protons for antiproton production, year around 120 GeV/c low intensity slow resonant proton extraction (slow spill) for test beams to all experimental areas, 120 GeV/c high intensity slow spill for dedicated kaon experiments, and 120 GeV/c high intensity fast resonant proton extraction for dedicated neutrino experiments. Much of the instrumentation is scheduled to be recycled from the existing Main Ring while some is to be newly built. A brief description of the Main Injector parameters will be presented along with instrumentation requirements for the accelerator and its associated beamlines.