I recently had a music shop far away from me install the Stew Mac Freeway 6 way switch into my Gibson with three humbucker pickups. I am trying to test whether the switch was installed correctly by finding all of the combinations, such as middle/neck; neck/bridge; and so on. The embarrassing part is, even with using a coin to tap on a pickup to tell whether it is switched off or on, I'm having trouble determining whether it is off or on! I need to be able to tell whether a pup is on or off to test that the switch is installed correctly. Is there a better way for me to tell whether a pickup is off or on than by tapping it with a coin? All three pickups have their covers on. Thanks!