I installed a Carvin pre assembled pickguard assembly on a coworker's strat. The assembly has 3 single coils, 1 volume, 1 tone and a toggle switch to turn the bridge pup on so you can have all 3 pups on in position 4 or neck/bridge on in position 5. Anyhow, we wanna change it to a more standard look so I have a push pull pot and want to make it a tone control like on a regular strat, but still have the ability to pull it to turn the pickup on.. How do I wire this??? Thanks!