I'm in the process of putting a 93 Mustang 2.3 in
my 76 Pinto wagon. So far it has been fairly straight
forward. I took the complete dash and underhood wireing
out and replaced it with the complete Must harness. With
the fuel tank in the spare tire well, and fuel lines
running in the car thru the removed door,it runs. I used
a Merkur T-9 trans. I have since "weeded" out the wireing
to pretty much a "run only" harness. I have a Ralley wireloom
that I bought on e-bay with all gauges. It is quite unique,
as I bought it out of Canada, so it is in kilometers (180)
primary and mph secondary (110) as apposed to the standard
80 mph. Sat. I will marry the ignition switchs and everything
will be on the pinto loom (including alternater, as I bolted
the original on the late model bracket, with a pully change).
Yes, it is running a serpintine belt. All that to say this.
My dilemma. How do I hook up the factory tach? It is an 8 plug
crank trigger system, and it would appear I have the tach signal
wire from the Mustang dash, but does anyone know how I integrate
it into the Pinto tach? I'm useing the Pinto wireing for all the
other gauges, so I'd assume the tach would only lack the signal.
There are four wires on the back of the tach. Which wire am I
needing to attatch the signal wire to? Or is it not that simple?
Any help would be much appreciated. Sorry to be so long.
Bill
First, you said "fuel lines running in the car". If this means you ran the fuel lines through the passenger compartment, this is not the safest route and is not allowed by NHRA. This thread may also help with fuel safety.
http://www.fordpinto.com/smf/index.php/topic,2174.0.html (http://www.fordpinto.com/smf/index.php/topic,2174.0.html)
According to my sales brochures and wiring diagrams, the rallye/sports option (tachometer) started in 1977 (maybe the option was added in late 76 after the publications were printed). Using 77 Pinto and 92 Mustang wiring diagrams (did not have a 93 diagram), below is my best guess at it. Disclaimer: I do not have your set up and have not tried this, not sure if the two tach signals are compatible. Have fun.
- red with light green stripe wire gets connected to +12V that is hot when the ignition switch is in the run position
- black wire gets grounded
- gray with black dots wire is left unconnected (this wire gets grounded when you have a V6)
- dark green with yellow dots wire is the tach signal input and I suspect should be connected to the Mustang IDM wire (on the 92 it is tan with yellow stripe wire, EEC pin 4, and DIS module pin 12)
I already have the enertia swith mounted and hooked up.
The car is disassembled to a point where I could work
on it unhampered. Windshield is out-dash out-no front
sheetmetal-no doors. This made it easy for me to acess
every thing. I have a Merkur pump I will mount on the
framerail this weekend. This was just an exercize to
"weed" the wireloom and make sure I didn't eliminate
any critical wireing. It still runs so I'm on the right
track. I hope to start reassembly tomorrow. Thanks for
the tach imfo. I'll let you know if it works. I'll try
to post some pictures this weekend. Thanks again.
Bill