Tach Install- ONE question?

Reply Subscribe

Thread Tools

Search this Thread

Apr 10, 2007 | 01:05 PM

CANTDR55

Thread Starter

Tourer

Joined: Oct 2004

Posts: 337

Likes: 5

From: Westchester NY

Tach Install- ONE question?

Hello all

I'm about to install an autometer tach on my 05 night train (carbed)
I have most of info on the how- to that I got from this site.

Need one answer I've not found here or in my service manual.

Are the ignitions 1 pulse or 2 pulse? Need to set that on the tach.
My dealer is not very helpful and I'm only going to try to pry that out of them as last resort.

I'll take pics and post as much info on this all for those who need it in future.

Thanks

Rob

Apr 10, 2007 | 01:25 PM

TheGeek

Road Warrior

Joined: Feb 2007

Posts: 1,280

Likes: 2

From: SC

RE: Tach Install- ONE question?

I don't know for sure, but I would guess 2.

Apr 10, 2007 | 02:06 PM

JohnK/Pa

Tourer

Joined: Feb 2006

Posts: 429

Likes: 1

From: Southampton, Pa

RE: Tach Install- ONE question?

All the Twin Cam engines are single fire ignitions (1 coil for each cylinder), If your using the diode that hooks to both coils you would have 2 pulses, if your only hooking to 1 cylinder you only have 1 pulse. I hope this helps more than it confuses.

Apr 10, 2007 | 02:40 PM

CANTDR55

Thread Starter

Tourer

Joined: Oct 2004

Posts: 337

Likes: 5

From: Westchester NY

RE: Tach Install- ONE question?

thanks
that does make sence. the tach wire(s) just plugs into harness with speedo. Should get both pulses.

Have to give that a try and see how it all works out.

Apr 10, 2007 | 04:43 PM

hoofnhog

Road Captain

Joined: Oct 2006

Posts: 559

Likes: 51

From: maine

RE: Tach Install- ONE question?

Like you guessed, if you are using the OEM harness and plugging in there, you are getting both pulses. Good luck..it's really pretty straight forward.

Apr 11, 2007 | 01:08 AM

SimonP5150

Novice

Joined: Jul 2006

Posts: 18

Likes: 0

From:

RE: Tach Install- ONE question?

I installed the Baron tach on my '06 and had to connect to both of the wires coming off of the coil into the ign module. What you could do is set your tach to double fire mode and take the signal from one of the positive wires coming off of your coil. On our bikes there is no tach signal wire in the harness under the tank. Your manual will tell you which wire to connect to. The power and ground connections were easy, I tacked on to my speedo power and ground wires and have had no problems thus far. Get er done.

Apr 11, 2007 | 10:11 AM

JohnK/Pa

Tourer

Joined: Feb 2006

Posts: 429

Likes: 1

From: Southampton, Pa

RE: Tach Install- ONE question?

When I installed the tach on my 05 it didn't have a wire from the ECM to the speedo so I had to run it all the way from the tach to the ECM terminal.

Trending Topics

The Next Generation of Super Glide

38

1.1k
Will Harley bring back the Ultra Limited with

37

1.2k
Harley-Davidson Brings Revolution Max Production Back To U.S. In American...

30

1.3k
The Next Generation of Super Glide

21

491
What did you do to Your Sportster Today?

17.1k

2.7M

Apr 11, 2007 | 11:45 AM

CANTDR55

Thread Starter

Tourer

Joined: Oct 2004

Posts: 337

Likes: 5

From: Westchester NY

RE: Tach Install- ONE question?

So here's where I'm at.
I'm all wired up except for the tach leads. I'm stuck waiting on getting the pin connector from HD. Other thing Is I'm getting conflicting ideas here.

According to wiring diagrams there is no tach hook up- per say- on my CARBED 05.

Had I had a EFI you can just go right to the ECM and you're done.

From all that I've gotten from this site I can still plug leads into #3 slot at speedo and be done.

Also I have TWO leads for this Auto meter tach. In theory I can twist both together then I can go the 'pin to the plug' route at speedo and be all set.

Other ideas is to plug one tach wire to each of the leads at the coil and get same effect.

I'm just waiting on pin from HD and I'll try that first as I'm set to do that without opening up any more of the wiring harness.

As soon as it's all up and running correct I'll post how to and pics to help others in same boat.

Thanks one and all for imput.

Rob