ACCEL HEI Battery and Tachometer Pigtail Harnesses eliminate the need for old, obsolete spade terminals that can fall off and kill your ignition. Color-coded to make identifying the tach and battery connections a breeze, the wires are housed in a connector with a locking tab and a shark fin that ensures a tight, positive fit and a reliable connection between your wiring and HEI. These connectors are made of high-temperature plastic rated at more than 250 degrees and have two 10-inch leads coming out of them for easy installation and a clean connection.