Re: Adding Tachometer
Just about every electric start Chrysler used a standard cable to the switch and terminal on the engine. Depending upon ignition type, some wires may not be used and some are used for different purposes.
Nit knowing for sure if you have magneto, battery, or electronic ignition, I will start with magneto.
With magneto ignition, the white wire and the blue wire each go to one "M" terminal on the switch. when you turn off the switch, the "M" terminals are in continuity and the points are shorted through each other thus killing the spark. With this type of ignition, a tach is wired to either the white or blue "M" terminal for "Signal" and the tach is set for 1 pulse per revolution.
If you have battery ignition with two coils and points, the blue wire is connected to the "I" terminal on the switch and supplies power to the coils which the points interrupt when open--thus causing spark. white wire is not used in this system, which leads me to believe that this is what you have. If the engine has an alternator and the stator is a 12 pole stator, you could use the purple wire for signal from the rectifer and set the tach for 12 pole position. Bear with me here. I don't have my manual with schematics. ---Otherwise, you would take signal just like in an auto, off one coil and set the tach to 1 pulse per rev position.
If you have electronic ignition, again, both blue and white wires go to "M" terminals on switch. CD box is shorted from white through blue to ground to stop spark. You use the purple wire for tach signal and set tach to number of poles in stator. Purple wire is attached to one of the A/C terminals on the rectifier
Type of tach you buy is also (obviously) dependent on the ignition type and where signal originates.
