[Guest]

We have a couple 60's Mustangs with stock, built-in tachs. When we added newer power with stock Ford electronic ignition the tachs quit working. In the wiring diagram the older tachs feed off the positive side of the coil. Typically, EI cars feed from the negative side. Anybody know how to make this work?

 

[nosaj122081]

Well, stock Ford units are current sensors, ie inline w/ the resistance wire connected to the postive side of the coil... did you make sure to hook it up like that? If that doesn't do it, are you sure the tachs are any good? Of the 2 I've had experience w/, 1 was completely bad and the other needed restoration. However, if you are sure you have good tachs that are wired properly, I know some manufacturers make a little part (the name of which slips my mind... DOH!) that hooks between the + and - coil terminals to provide the tach w/ the signal necessary to make it work. Good luck!

-Jason

'72 Mach 1 || '90 Talon TSi AWD
http://nosaj122081.tripod.com/parade3.jpg
"Thats not a leak, my car's marking its territory!"
"If you've done it, it ain't braggin'." -Roy Rogers

 

[mstngjoe]

Dale,
My 65 wiring diagram shows the wire going from the factory tach to the coil is PINK. I don't have any other wiring diagrams. Seems to me we have an electrical guru here on the VMF who likes to "check your shorts". Maybe he will have an idea.

65 FB "J" 302 lots of mods. 94 GT K&N only.
http://albums.photopoint.com/j/view?u=1590489&a=12113030&p=43871256&Sequence=7&res=high.jpg

 

[autoxsteve]

I just recently installed a rally pac in my 65. I've got a Mallory Unilite distributor. Here is how it is supposed to be wired: There is a connection near the ignition switch that has a red wire with a socket (switched 12 volts - ignition position of switch only) and a pink wire with a male plug (hot or + side of coil). The pink wire is actually the ballast resistor for the coil (so it doesn't burn up). The rally pac tachometer connects in between these two points.
Nationa Parts Depot sells a rally pack wiring diagram that shows all of this wiring in detail. Go get it and check it out.



Steve Leslie, 65 coupe in restoration. 302, toploader, A/C, disc brakes, bench seat

http://albums.photopoint.com/j/View?u=1571478&a=12535662&p=46267978&Sequence=1.jpg

 

[Guest]

Jason. If you think of that manufacturer's name that makes the "adapter gizmo", I'd appreciate knowing it. thanks, Dale

 

[Guest]

Thanks, Autoxsteve. We will check it out on the 66. Now I wonder about the 69 Mach where it's all "built in".
Mustang Joe spoke of a great electronic guru, the High Lama of electronics,--- is that you?

 

[Midlife]

Sorry, but I can't offer any advice regarding the tachs and non-point or Pertronix ignition systems. Give Mr. Tachman a call

http://clubs.hemmings.com/baymustang/platesmall.jpgLet me check your shorts! My multimeter is just a-waiting! Formerly known as Midlife in the old VMF.
King of the Old Farts *struts*

 

[nosaj122081]

Well, I know Mallory makes one, I bought one and didn't need it afterall /forums/images/icons/frown.gif... For that one, check out http://www.centuryperformance.com... MSD also makes one for their distributors, don't know if theres any differences in them, but I saw the MSD one in one of the big catalogs, either Summit or Jegs or both maybe. Good luck!

-Jason

'72 Mach 1 || '90 Talon TSi AWD
http://nosaj122081.tripod.com/parade3.jpg
"Thats not a leak, my car's marking its territory!"
"If you've done it, it ain't braggin'." -Roy Rogers