Description
AutoMeter Sport Comp 30 in HG 30 psi Boost Vacuum Gauge Mechanical Analog 2 1 16 in Diameter Black Face YXZ STX G1 HK 1981 1981 Chevrolet Corvette 1996 2000 Dodge Ram RCEPMM4071 H22 OPG Size:4X Large (67 68) 1981 1981 Chevrolet Corvette The ECU requires to know when cylinder number one is firing (or preparing to fire) so it knows the sequence of the injectors coming next