Add to Favorite Sellers. Holley EFI 12-886KIT Holley Die Cast EFI Bypass Fuel Pressure Regulator Kit. 15-60 Psi – Fittings and Gauge Included; Holley Die Cast EFI Bypass Style Fuel Pressure Regulator Kits are part of a complete line of fuel system products from Holley. The included 12-886 regulator features a die cast aluminum body and a black finish for corrosion resistance and good looks. The regulator contains 3/8″ NPT in/out ports, a 3/8″ NPT return port, a 1/8″ NPT gauge port, and a 1/8″ NPT vacuum port for Boost Reference (1:1). In addition, 3 Mr. Gasket 3/8 NPT to -6 AN 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!!