Holley Sniper 2 EFI Input/Output Wiring Harness # HO558-497Wire Harnesses, Sniper 2 EFI, Input Output Harness, Throttle Body Injection, Speed Density Metered, 6 pin Female Connector, Each Fuel Injection Style: Throttle body Metering Style: Speed density Quantity: Sold individually. Notes: Input Output harness for the Sniper 2 EFI systems. Holley Sniper 2 EFI Input Output Wiring Harnesses Holley Sniper 2 EFI input output wiring harnesses give you access to two ground trigger inputs, two ground trigger outputs,