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Tachometer for street twin?

37K views 23 replies 15 participants last post by  c317414 
#1 ·
Ciao, in your opinion is it possible to mount the tachometer of the street cup on the street twin? Have you ever read about it on the web? Do you have other tricks?

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#2 ·
Anything is possible. I would investigate whether the ST has a wiring harness connector built in for a tach. I would think it is highly probable since the T120 has a tach as well as the new Street Cup and T100. With a tach lead built into the wiring harness, it will be much easier to add either an aftermarket tach or purchase a set of gauges from the new Street Cup or T100. I am sure someone here will have access to the wiring diagram for the ST and give you an answer. I am with you, I would want a tach.
 
#5 ·
I rode with a guy yesterday who's had his yellow and gray Street Cup for just two weeks now. His tach and speedo look exactly like they do on my T120, right down to the graphite color on the bezels and the information displayed. The instrument mount looks to be completely different, though. I'm just not familiar enough with the instrument set up on the Street Twin to know if any extensive disassembly would be required to substitute one mount for the other.

The LCD displays on the SC and ST are really different as well. Do the ST and SC already share an ECU that would recognize the SC's instruments, requiring only a re-flash? Don't know.

My buddy's Street Cup does have heated grips, but he's having trouble with them. Occasionally one grip or the other goes cold. The temperature also sometimes goes from LO to HI without being selected to HI. These are items for the bike's 500 mile service, coming up soon.
 
#6 · (Edited)
I rode with a guy yesterday who's had his yellow and gray Street Cup for just two weeks now. His tach and speedo look exactly like they do on my T120, right down to the graphite color on the bezels and the information displayed. The instrument mount looks to be completely different, though. I'm just not familiar enough with the instrument set up on the Street Twin to know if any extensive disassembly would be required to substitute one mount for the other.
The gauge mount for the ST speedo is built into the headlight ears so that whole piece would have to go, you would then need to use the instrument mount of the Cup which bolts to the triple tree, assuming they both have the same tree...I am pretty sure it simply bolts to the handlebar bolts under the tree, so theoretically that should not be an issue. One would need to use some aftermarket set up to then mount the light.

One might be able to use the SC headlight frame (which is like the Thruxton), but I am just not sure whether the ST has the correct mounting points built into the tree though. Will need to investigate further on that. But just mounting the instruments should be very doable with the SC instrument bracket and new headlight ears of one's choosing...again assuming it is wired in already.
 
#7 ·
FWIW, I just don't look at the tach much on my T120, probably because there's little reason to run the bike at higher RPM. The chief function of the tach seems to be to give the bike the two dials look (which I like), and to give room for a second LCD screen and more idiot lights.
 
#9 ·
I'm interrested to know that as well.

I'm looking to install the speedo and tacho of the t100/Street Cup on my Street Twin but I do not know if it's only plug and play or if I really need to change the wires and everything.

If someone knows if that's possible, please let me know.
 
#12 ·
I really want to know the answer to this as well. Seems to be one of the great mysteries surrounding these bikes.

All of the bikes in the modern classics lineup have a tach readout, whether it's the LCD single clock on the Bobber and Street Scam or the dual clocks on the T120, T100 and Street Cup.

I purchased the main harness diagrams for the Street Twin and Street Cup. Can anyone compare the two and answer this question?

https://1drv.ms/f/s!AmPEs43IDoZybHe0lQdQbQMa6Bc
 
#21 · (Edited)
Seems a shame about that instrument in the video. I've been searching for the instructions without success so far. The model to look for is Daytona 65705, a search produces lots of results but mostly in Japanese. It can't be difficult to install as on some sites just 3 connections are shown, like on this one, costing around $130:

http://global.rakuten.com/en/store/onsoku-hassouya/item/4909449317952/

$95 here. It also has some vague instructions poorly translated, but it seems to indicate the signal connection is to the ignition coil wire, the other two will be to a switched +12 volts:

http://global.rakuten.com/en/store/bike-man/item/10010271/

It can't be long before an enterprising Western after-market peddlar gets one and tries it out and offers them for sale with a juicy mark-up, I know I would if I was in the business...:)
 
#24 · (Edited)
There's a company that makes replicas of the early Smiths Chronometric Tachs that work off a digital signal. One of these would look cool on a modern Triumph: http://www.puca.co/productc.html

This is from their website's FAQ:
The units will work on any machine with a 12v supply and a conventional ignition coil for the tacho pick-up. The wiring of the tachometers is also compatible with dedicated ECU rpm signals.
It is also possible to use a HT signal amplifier to drive the tacho for ignition systems with "exciter" type coils or magneto driven igntion systems, the tacho units will still require a 12v supply.


 
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