Holley EFI LS Main Harness to LS3-style MAP Sensor Adapter 1999 Pontiac Firebird Monitor The Speedometer

Monitor The Speedometer

HC10-HDSS kit features ACT's most popular Heavy Duty pressure plate and most popular street disc

12 V square wave signal output

B015X is an ACT Xtreme pressure plate that uses exclusive diaphragm design to increase clamp load

Holley EFI LS Main Harness to LS3-style MAP Sensor Adapter 1999 Pontiac Firebird Monitor The SpeedometerHolley EFI LS main harnesses have a MAP sensor connecter designed for use with an LS1 2 style MAP sensor. The 558 416 is an adapter harness that can be used to adapt any LS harness that uses an LS1 2 MAP sensor connection to an LS3 MAP. Also great for use with LS Hi Ram intakes that require an LS3 MAP sensor.