[92snowmachine]

when i test injectors on the bench i jump power to the power side from a battery and then hook the negative side of the battery to a file. use a jumper between the file and injector signal. use a needle or something sharp and run the jumper across the ridges on the file. this will create pulses to make them spray. the faster you run it the shorter each pulse is. definitely redneck mechanics but it works.