Hood Tacho - 1969 Firebird 5200 RPMThis is a 1969 Firebird 5,200 RPM redline repro of the original Hood tach as found on the Firebirds its now modern inside. which was common originally for fragile circuitry & hence for breaking down. Extreme Caution when wiring up the tacho Never ground the TACH terminal; serious ignition module (if a HEI Dissy is fitted) and coil damage will result. If there is any doubt as to the correct tachometer hookup, check with the tachometer manufacturer. It