New Combination Digital Speedometer/Analog Tachometer
Road Warrior
Joined: Jun 2009
Posts: 1,333
Likes: 3
From: Jefferson, Oregon
Gotcha. I don't have a parts manual, good luck and no problem. I'm sure there are a few guys wondering the same thing, maybe this will help them out too. Be sure to let us know if this works for you.
Ultimate HDF Member
Joined: May 2008
Posts: 6,642
Likes: 48
From: Ogden, UT
I would assume, (you know what they say) that it is 2 different data protocols, so I have serious doubts they will swap out.
Even if the ECM looked identical, the protocol could be different, you really need a MoCo engineer to explain this, hooking up the wrong thing could cost you an ECM.
Wiring is a piece of cake until they run data protocols.
Wish I had the definitive answer, but I think that should only come from someone that truly understands those things, hate to see you create more problems than it is worth.
Even if the ECM looked identical, the protocol could be different, you really need a MoCo engineer to explain this, hooking up the wrong thing could cost you an ECM.
Wiring is a piece of cake until they run data protocols.
Wish I had the definitive answer, but I think that should only come from someone that truly understands those things, hate to see you create more problems than it is worth.
Ultimate HDF Member
Joined: May 2008
Posts: 6,642
Likes: 48
From: Ogden, UT
You can get a tach signal from the front cylinder coil if the tach you are hooking up will accept the signal, if it is a HD tach designed for the ECM, most likely that wont work.
Ultimate HDF Member
Joined: May 2008
Posts: 6,642
Likes: 48
From: Ogden, UT
That sounds logical, I would also check wiring diagrams for both bikes. Just to verify everything.
Advanced
Joined: May 2009
Posts: 52
Likes: 0
Airborne: Its got nothing to do with wiring. All pre 09 models are not equiped with the miles to empty function for the gas. Thats the only difference. I installed the combo tach/speedo you mentioned on my 08. First time i fired up it showed low fuel when i had just gased it up. I cut engine and fired up again and it was gone. Works perfectly on my 08. Had it for almost 2,000 miles now. Cheers!
Thread Starter
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Club Member
Joined: Jun 2007
Posts: 3,435
Likes: 28
From: Living in open carry state :D
Hey Pharaoh,
So it is working on your '08 then it should be good to go on my '07. Thanks a bunch... Now to order it...
So it is working on your '08 then it should be good to go on my '07. Thanks a bunch... Now to order it...
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Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
Can't help with the wiring but I put one on my '10 Fat Bob a couple of weeks ago and its a real nice gauge, cheaper than the two-dial ones too. Display is large and easily readable and, of course, its a huge plus to gain a tacho. Only tiny downside is that the 6th gear indicator isn't that clear in sunlight - no biggie.