https://www.reddit.com/r/PowerWheelsMods/comments/i1ez3j/power_wheels_mustang_smart_drive_turbo_button/?utm_medium=android_app&utm_source=share

I installed these in two PW mustangs:

https://www.amazon.com/dp/B07F24Y1TB/ref=cm_sw_r_cp_apa_fabc_RW946JSA7PKE11PZ12NP?_encoding=UTF8&psc=1

Solder, shrink wrap, bend to fit inside the wheel.