Wiring color code and plug position 1972 dash with tach Aug 25, 2007I have a 1972 dash with tach. and the circuit board has been burned out in several places. The wires have bin pulled out of the smaller plug. I have a new circuit board and need the color code and correct pin position so I DO NOT burn up the new Author: Flade 1972 mustang tach | eBay Find great deals on eBay for 1972 mustang tach. Shop with confidence. Skip to main content. eBay Logo: 1972 FORD MUSTANG ALTERNATOR WIRING HARNESS W TACH 302. Brand New. $44. Was: Previous Price $49. Buy It Now +$7 shipping. OEM Ford 1971 1972 1973 Mustang Tach Dash Cluster Gauges Speedometer Mach 1 See more like this.