Automotive conversion systems comprised of motors for land vehicles, fuel lines for vehicles, heat exchangers being parts of engines for land vehicles, internal and external storage tanks for natural gas for land vehicles, pumps for cooling engines, power valves for carburetors, metal tube fittings in the nature of sockets, natural gas compressors, electronic sensors, electronic motor drives and electronic controls for motors, and electronic display screens, all designed to convert land vehicles powered with internal combustion engines to function both as self-propelled vehicles and as stationary compressor systems for compressing and storing natural gas to be stored and used as fuel on that vehicle