Guitar pickup switch LED wiring
The page gives you this information:


  Connect 3 to 6V to the LED to have it light up nicely, there's a built in resistor! If you want to use this with a higher voltage, say 12V or 24V, simply add a 470 ohm resistor in series with the LED connection to keep the LED current at around 20mA.


For 9 V I would start off with the 470 Ω resistor (to maximise battery life) and decrease the value to half if it's not bright enough for you. 

You've got a problem though:


  Switch contacts: 1 NO [normally open], 1 NC [normally closed].


Actually the switches have one changeover contact - they're not even separate.







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. Required switch wiring. You need a 2PST (2-pole, single-throw) switch.



Figure 2. Linear voltage regulator.

A 7809 voltage regulator will do what you need to drop the battery voltage to 9 V. Don't be tempted to leave out the capacitors as these are required to prevent oscillation. 'Input' is from your battery. 'Output' is to your effects unit.

Finally, you should probably figure out some method of bypassing the FX should it fail mid-gig.