Simple install, just untie E string, remove 4 screws from existing tuning machine mounting plate and replace screws (spare screws included in package) and calibrate tuning. Setup instructions are available online.

I think this is model BT7, but it is designed specifically for a MIM P-bass. Just never got around to installing it, and not playing as much these days.

I guarantee return for refund within 7 days of delivery if it does not fit (buyer pays return shipping)