I was disappointed that my Supro Blues King footswitch didn't have status indicators. The amp doesn't either but at least you can look at the toggle switches' positions. I wrongly figured that adding a couple of LEDs would be an easy deal. I say wrongly because the power to the footswitches is -13.8vdc and -15.2vdc on the Gain and Boost switches, respectively. Furthermore, the Gain is ON when the switch is open (not shorted to ground) while Boost is OFF when not shorted to ground. When using 12V LEDs with the proper resistor values added the darned functions wouldn't work, even though the LEDs switched on and off. Also, the amp's functionality with resistors but no LEDs worked fine. The saving grace was that the original switches each had 2 rows of 3 pins that were isolated electrically with one row on each switch being unused. I eventually decided to add a 9vdc jack (standard pedal power) and switch power to the two LEDs independent of each other and not affecting the original circuitry in any way. It came out pretty well, I think, and isn't overly bright since It is 9v into 12v LEDs. I forgot to include a fuse on the 9v power though.