The 7al3 does provide a ground and a closed circuit when the desired chipped rpm is reached.If you put a test light on the ras output terminal you should have voltage.This is normal. Your wiring is correct, however With an electric shifter I would wire the shifter to a relay and let the 7al3 energize the relay to activate the shifter. The rpm switch in the box may not be able to handle the current required to activate the shifter. Also the car may need to be running and the alternator charging to kick the shifter.