Add to Favorite Sellers. 12-846KIT Holley EFI Billet Bypass Fuel Pressure Regulator Kit. 15-60 Psi – Fittings and Gauge Included; Holley EFI Billet Bypass Style Fuel Pressure Regulator Kits are part of a complete line of fuel system products from Holley. The included 12-846 regulator features a billet aluminum body and a black finish for corrosion resistance and good looks. The regulator contains 8 AN in/out ports, a 6 AN return port, a 1/8″ NPT gauge port, and a 1/8″ NPT vacuum port for Boost Reference (1:1). In addition, 3 adapter fittings, a barbed fitting for the vacuum port, a mounting bracket, and all necessary hardware are also included. Customer Service & Feedback. So we have a chance to make it right – we want your repeat business! Check out the official Holley Performance. For more great deals!!