malcolm300 10 Report post Posted October 9, 2014 just a quick one my dash has a factory tac in it but the wiring isn't for a tac, so dose anyone know where the two wires on the tac connect to? like I said its a factory tac and I have bypassed the pink resistor wire as I have a rtr distributer. cheers Quote Share this post Link to post Share on other sites
barnett468 418 Report post Posted October 9, 2014 (edited) ford wiring diagram for 68 may be different than your tach ill check later tonight. . the tach man may have a diagram online also. black wire on 2 wire assy goes ito neg side of coil black with green stripe to distributor black wire on 3 wire assy goes to ground blue with rd stripe on 3 wire assy goes to blue with red stripe on black of bevel for lites. http://www.allfordmustangs.com/forums/attachments/classic-tech/89255d1264897998-1968-mustang-wiring-diagrams-tach-please-help-tach-wiring-diagram.jpg Edited October 9, 2014 by barnett468 Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted October 9, 2014 malcolm300, If it is still an original Ford Tach that hasn't been retrofitted, then you should get a Ford wiring schematic. I don't know what year you are working with, but the original two wire Ford tachs for 1969 and 1970 Mustangs were wired in series with the pink resister wire going to the positive side of the coil. I've seen these referred to current triggered tachs as opposed to newer voltage triggered tachs. Connecting it wrong can damage the tach. Plus there are also wiring differences going from an ammeter to a warning light. Quote Share this post Link to post Share on other sites
TheRktmn 15 Report post Posted October 9, 2014 OEM wiring for 'two wire' tachs: Ignition switch 'ON' to tach red. Tach black to coil + terminal (by way of 'pink' resistor wire). FoMoCo used this style of tach for many years. Quote Share this post Link to post Share on other sites
barnett468 418 Report post Posted October 10, 2014 hello malcolm . if your tach has a red wire it connects the way rktmn posted . . if it does not have a red wire it connects the way i posted .. . if it has the red wire then the black wire goes out and must be connected to the pink wire or a resistoir coil or a 1.5 ohm resistor . . use the resitor if you want to keep 12v to the coil .in which case you will end up with a power wire and the tach connnected to the pos side of the coil. Quote Share this post Link to post Share on other sites
malcolm300 10 Report post Posted October 15, 2014 cheers guys ill get it all hooked up tomorow. Quote Share this post Link to post Share on other sites
