Thank you for the help but I need help on something else. Where to get the power chip and making sure it’s the correct one. Most of the power chips I’ve found are knobs, but the chip on the original guitar had a switch. Any advice on that?

I have a Parker p40 that is very broken as it no longer has its piezo preamp. It’s re-wired and now I don’t know what to do to fix it. If someone can assist me I can discuss this in further detail.