Tach hook up to HEI - Chevy Message Forum - Restoration Dec 10, 2011Chevy Forums FREE technical assistance for your restoration and repair. Model specific subject matter experts, classified ads and more. If you look at the top of the HEI distributor, it has a label on it that says "Bat" and "Tach". You hook the wire coming off the tach to Chevy HEI Distributor Wiring Ignition Tachometer Wire www›Search›Chevy HEI Distributor Wiring Ignition Tachometer Wire ConnectorsFind best value and selection for your Chevy HEI Distributor Wiring Ignition Tachometer Wire Connectors search on eBay. World's leading marketplace.