Hedman Street Headers - 1.75 in Primary - 3 in Collector - Metallic Ceramic - Big Block Chevy - GM Fullsize SUV / Truck 1967-91 - Pair CS-MUSIC-REC It wires inline on the WAR85330 Size:7-1/2 (60) C5 R4 Valve Ignition Wires

It wires inline on the coils' 12 volt supply wire where it senses the current going through this wire and converts this information into a 12 volt output signal that most aftermarket tachometers use as a trigger signal

3 in Center Inlet Outlet

but can lead to limited choices for a distributor

Racepak For extending V-Net connections

a GM engineered fuse block and Painless mounting bracket

Hedman Street Headers 1.75 in Primary 3 in Collector Metallic Ceramic Big Block Chevy GM Fullsize SUV Truck 1967 91 Pair CS MUSIC REC It wires inline on the WAR85330 Size:7 1 2 (60) C5 R4 Valve Ignition Wires It wires inline on the coils' 12 volt supply wire where it senses the current going through this wire and converts this information into a 12 volt output signal that most aftermarket tachometers use as a trigger signal 3 in Center Inlet Outlet