P1 should be wired with neck pickup positive; P2 should be wired with bridge pickup positive; GND should be wired with two pickups negativeHigh quality preamp, not inferior Circuit made in cheap factoriesPlease your local luthiers if you don't know how to install the CircuitSpecifications:Condition: and High QualityVolume B50KPickup MN250K: +/- 14dB 80Hz B100KMiddle: +/- 8dB 900Hz B100KTreble: +/- 23dB 3-7KHz B100KMaterial: Metal + Plasticcolour: Random ColorNote: Random color, don't accept the specified color.Package Contents:1 x Preamp CircuitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.