I have my factory Mach 1 (Shelby) dash wire harness out of my car and can help you identify if it is a tach harness or not. At work now so unless someone else can assist sooner, will have to be this evening before I can get to mine.

Did'nt all Mach 1's have Tach's?

 

Not in 1970 they didn't.

 

Mach's came with the "Deluxe" Interiors. So if it is a 69 as the OP states, and its the original harness, it should be for a Tach Cluster.

 

Not all 69's had the tach. Fact, most did not.

JSR, Get a hold of Midlife on the boards, he restores harnesses, and I'm guessing could tell you easily what to look for.

 

I had a 69 Mach1 with no tach.

 

So the Deluxe interior does not include a Tach on the 69 Mach 1?

 

That would make sense as mine is a 351/FMX and has no tach. I remember years ago wanting to put a tach in a truck I was fixing up and friends asked me why because it wasn't a manual.

 

My Mach 1 428CJ w/C6 had a tach, as does my 351w w/FMX. I'll have to check my Marti report and see if the Tach was an addition to the Deluxe interior. Remember, all 69/70 Shelby's started as Mach 1's.

 

So it seems not all Mach1's came with a factory tach. I will look up and contact "Midlife" and post an update once more is learned. in the mean time I will take a picture of the connector and hopefully those with a wired tach can determine the difference in pin/wire position in theirs versus mine.

In the meantime I will be installing the new Traction-LOK rear end, delivered yesterday. New 9" Housing (correct length versus what i have now) 3:70 ratio, new axles & bearing plus disc brakes w/ parking break from Quick Performance.com out of Aimes Iowa

 

See attached,............... I would also take a quick look at your alternator harness under the hood. if it has a 3-pin connector, its for use "with tach"

 

OK thank you for the fresh info, this gives me a basis to discover my answer

 

#1 My apologies for not getting back to you sooner.
#2 How did I forget this?

The Tach attaches with a separate 2 wire plug.

 

Do you have the tachometer? If so, cool. If not, think hard about this. If you can find a 1969 tachometer, it will likely run you about $1,000. Furthermore, it's iffy if said tachometer actually works. So, you spend a grand, find out it doesn't work, then send it off to someone who can maybe make it work again. Sure, a factory tach is cool, but for my 1970 Mach 1, I decided I'm going to install a hood tach. (It was a Ford, over the counter option.)

I can also confirm with absolute certainty that tachometers were optional for the 1969 and 1970 Mach 1 Mustangs. In fact, almost everything was an option. The person who ordered my car checked the option blocks for "Mach 1", "Shaker" and "Tinted Glass" and nothing else. Thus, my Mach 1 had drum brakes all around, manual steering, a 3-speed manual and a 351 Cleveland 2V with single exhaust and a shaker. Bizarre, yes. But as I said, everything else was optional so my car didn't have it.

The 1970 Mach 1 package included deluxe interior, extra sound deadening, aluminum rocker panels, honeycomb taillight panel, driving lights, twist hood locks, hood stripe, 351 2V engine (Windsor or Cleveland, depending on timing and happenstance) and a 9" open differential with a 3.00 gear. 4V carb, dual exhaust, disc brakes, 4-speed trans, Traction Lock or Detroit Locker, auto trans and tachometer were all optional.

In 1969 it was the same, but there was no aluminum rocker panels, driving lights, twist locks or honeycomb taillight panel. The '69 Mach 1 got stick-on side stripes and a blackout hood with hood pins.

I've even seen books stating the shaker option was only available with the 4V engine. My car and its Marti report are actual proof this is not true.

 

I'm looking at my Marti, no mention of a tach. And the 69 Mach's got a low chrome molding instead of the aluminum panels.

 

A tach was standard for a Shelby, but not a Mach 1. Wasn't the low chrome molding standard for the 69 and 70 fastbacks?