Harley Davidson Forums

Electrical/Lighting/Alarm Having electrical problems? Discussion on everything electrical and lighting systems.

Quick question on Tach wiring

Thread Tools
 
Search this Thread
 
Old Aug 19, 2020 | 08:38 AM
Share
  #1  
ricks2524's Avatar
ricks2524
Thread Starter
|
Advanced
Joined: Mar 2014
Posts: 60
Likes: 9
From: Ohio
Default Quick question on Tach wiring
Where the best place to connect to the Tach signal wire. I have an 06 Deluxe EFI . Don't want to take any unnecessary chances. Thanks
 
Reply
0
Old Aug 19, 2020 | 06:34 PM
Share
  #2  
Dallas 13's Avatar
Dallas 13
Tourer
Joined: Jan 2011
Posts: 300
Likes: 10
From: Black Hills
Default
Need some more info: was the tach stock, or add on; guessing you have the 88 TC? Do you have the service manual?
 
Reply
0
Old Aug 20, 2020 | 05:17 AM
Share
  #3  
ricks2524's Avatar
ricks2524
Thread Starter
|
Advanced
Joined: Mar 2014
Posts: 60
Likes: 9
From: Ohio
Default
Its an add-on. My manual doesn't list a "signal" wire. I'm assuming it means a + connection, but want to make sure before I go further . Yellow/Black
 
Reply
0
Old Aug 23, 2020 | 10:56 PM
Share
  #4  
Max Headflow's Avatar
Max Headflow
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,921
Likes: 8,026
From: poway
Default
The is a tach output on the ECM. Haven't tried using it tho..
 
Reply
0
Old Aug 28, 2020 | 08:14 PM
Share
  #5  
Zanthamos's Avatar
Zanthamos
Outstanding HDF Member
Veteran: Air Force
Joined: Feb 2015
Posts: 2,414
Likes: 433
From: Arkansas
Default
Tach comes off ECM, that tach you have is an analog tach and incompatible with EFI bikes. You need one that will have a Y splitter from the speedo or get the HD speedo with a tach on it.
 
Reply
0
Old Aug 28, 2020 | 08:28 PM
Share
  #6  
Max Headflow's Avatar
Max Headflow
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,921
Likes: 8,026
From: poway
Default
Originally Posted by Zanthamos
Tach comes off ECM, that tach you have is an analog tach and incompatible with EFI bikes. You need one that will have a Y splitter from the speedo or get the HD speedo with a tach on it.
I think you are trying to say the Tach needs to interface to the serial bus to get RPMs.. As far as I can tell the 06 ECM still has a Tachometer output which should be 1 pulse per rev.
 
Reply
0
Old Aug 28, 2020 | 09:12 PM
Share
  #7  
Zanthamos's Avatar
Zanthamos
Outstanding HDF Member
Veteran: Air Force
Joined: Feb 2015
Posts: 2,414
Likes: 433
From: Arkansas
Default
The tach signal is already at the speedo connector even though the wiring diagrams do not show a wire from the ECM pin 3 but it is a digital output signal not a ppm signal as you would get from the coil connection. There is not a good point to tie into the BE/O wire on the coil to get an analog tach signal.
 
Reply
0

Trending Topics

Old Aug 28, 2020 | 10:00 PM
Share
  #8  
Max Headflow's Avatar
Max Headflow
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,921
Likes: 8,026
From: poway
Default
Originally Posted by Zanthamos
The tach signal is already at the speedo connector even though the wiring diagrams do not show a wire from the ECM pin 3 but it is a digital output signal not a ppm signal as you would get from the coil connection. There is not a good point to tie into the BE/O wire on the coil to get an analog tach signal.

Well, if that's the case the y cable to the coil primaries is the only answer for that tach.
 
Reply
1
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Aug 29, 2020 | 05:28 AM
Share
  #9  
ricks2524's Avatar
ricks2524
Thread Starter
|
Advanced
Joined: Mar 2014
Posts: 60
Likes: 9
From: Ohio
Default
Originally Posted by Zanthamos
Tach comes off ECM, that tach you have is an analog tach and incompatible with EFI bikes. You need one that will have a Y splitter from the speedo or get the HD speedo with a tach on it.
I can make the splitter with a couple resistors and diodes. I will try the signal hook up qt the ECM.
 
Reply
0
Old Aug 29, 2020 | 11:12 AM
Share
  #10  
larsfum's Avatar
larsfum
Stellar HDF Member
15 Year Member
Liked
Top Answer: 1
Joined: Jan 2009
Posts: 2,578
Likes: 463
From: On a Lake, not far from the Gulf
Default
The tach signal wire is usually pink if that helps.
 
Reply
0
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
wiring new aftermarket tach
Sal C
Dyna Glide Models
10
Aug 28, 2020 10:51 PM
mini tach install
drifter64
Touring Models
6
Apr 18, 2012 04:49 PM
Tach question
bolillo57
Sportster Models
0
Jan 31, 2011 12:25 AM
Hooking up a tach question
Beauregard
General Harley Davidson Chat
0
Jun 21, 2009 09:14 AM
tach signal question
dfb
Ignition/Tuner/ECM/Fuel Injection
2
Feb 18, 2008 04:03 PM
Back to Subforum
Electrical/Lighting/Alarm
View Next Unread
battery optimiser




Advanced Search
Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 01:33 PM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE