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jonathan150cc
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Swapping out stock gauges - RESOLVED w/ pics
« Thread Started on Jun 15, 2009, 11:15am »
Can I just swap out my stock gauges, which have only a speedo and fuel gauge, for a gauge that has a tach as well?

To put it more simply, are these things wired to accept all the different gauge types?

I know that I can just get a tiny tach, but I'd prefer to have an actual in-dash tachometer.
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Re: Swapping out stock gauges - question
« Reply #1 on Jun 15, 2009, 11:48am »
I don't know if the wiring harnesses for scoots are all set up for in dash tachs or not. The only additional connection the tach itself has is a wire running to the wire which connects between the coil and the CDI (usually blue/yellow). Any additional wiring on the tach is for the meter lighting.

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jonathan150cc
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Re: Swapping out stock gauges - question
« Reply #2 on Jun 15, 2009, 1:07pm »
Well then in that case I could always just splice into the extra wiring. That's good news.

My other question then, is, can I manually adjust the odometer on these things? I'd like the odometer to match exactly.

Thanks,
Jonathan
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Re: Swapping out stock gauges - question
« Reply #3 on Jun 15, 2009, 7:07pm »
It's not the most elegant solution, but you can take the cable from the front caliper, lock a drill chuck onto it and run the drill until the new odo matches the old odo. At least in theory.
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Re: Swapping out stock gauges - question
« Reply #4 on Jun 15, 2009, 8:35pm »
Are there scoots that actually come with a tach? Where would you get an instrument package that has one?

I do have to admit, I was confused by the tach threads until I realized they were electronic; all of my old bikes had mechanical tachs.
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jonathan150cc
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Re: Swapping out stock gauges - question
« Reply #5 on Jun 15, 2009, 8:51pm »
I just ordered a gauge set with a tachometer, speedo in MPH, and gas gauge from PARTS FOR SCOOTERS. It should arrive on Wednesday. I´ll post her on how the installation goes.

Most all scooters are electronic, the difference is that they either read in digital numbers or analog gauges. The scoots that came with tachs have an analog gauge.

http://www.partsforscooters.com/100-37-Speedometer?sc=9&category=623

[image]
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Re: Swapping out stock gauges - question
« Reply #6 on Jun 15, 2009, 8:58pm »

Jun 15, 2009, 7:07pm, cagedodger wrote:
It's not the most elegant solution, but you can take the cable from the front caliper, lock a drill chuck onto it and run the drill until the new odo matches the old odo. At least in theory.


standard US speedometers were 1000 rpm = 60 mph. It was common for a metric one to read 100 km/hr at 1000 rpm. If your Chinometer is like that , you could run your speedometer up to maximum speed (80 mph?) and put on 1900 miles in a day. That could exceed the remaining life of a drill, so might get expensive.

Other input rpm/speed ratios have been used so YMMV
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Re: Swapping out stock gauges - question
« Reply #7 on Jun 15, 2009, 8:58pm »
Here's what mine looks like:

[image]

This style scoot (see avatar) also has the tach in the 150cc size. There may be one or two other styles in the Chinese scoot lineup that might have a tach.

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Re: Swapping out stock gauges - question
« Reply #8 on Jun 15, 2009, 9:03pm »
I´m not going to waste time fidling with the odometer unless it´s something I can just manually take apart and adjust it. I´ll see when it gets here.
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Re: Swapping out stock gauges - question
« Reply #9 on Jun 15, 2009, 9:17pm »
It can be done. Practice on your old one.

There are too many variables for anyone who hasn't take on like yours a part to answer. I did some over 40 years ago and they probably aren't much different now except for cheesier construction now.
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Re: Swapping out stock gauges - question
« Reply #10 on Jun 15, 2009, 9:30pm »
I plan on fooling around with the old one. Thanks for the input.
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Re: Swapping out stock gauges - question
« Reply #11 on Jun 17, 2009, 10:35pm »
Alright. I have all of the wiring swapped out and everything is working great, except for the tach...

I have 3 wires coming out of the tachometer. A yellow/black wire. a green wire and a black wire.

I have tried several different combinations but I can't get the tach to register anything.

Can someone give me a hand here? A photo of how your stock tach is wired would be awesome!!

Thanks,
JOnathan
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Re: Swapping out stock gauges - question
« Reply #12 on Jun 17, 2009, 11:48pm »
You may have to hard wire since your scoot probably doesn't have the proper wiring harness. The green wire goes to ground (a good metal contact on the frame), the black wire goes to any wire which supplies power to the instrument lights, the yellow/black wire should connect to the wire which is connected between the coil and the CDI (usually black/yellow).

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Re: Swapping out stock gauges - question
« Reply #13 on Jun 18, 2009, 11:19am »
Well there is my first problem. I assumed that green was power and black was ground.
All I need to do now is swap those wired and then fool around with different connections on the yellow/black wire until I get some response from the tach.

Thanks for the feedback. I was getting pretty frustrated lastnight.

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Re: Swapping out stock gauges - question
« Reply #14 on Jun 18, 2009, 11:43pm »
That last bit of advice was a God send. Green wire was grounded to the dash stay bracket. Black was tapped into the rear brake wire power line. The yellow/black wire was extended and hard wired into the yellow/blue wired that you can find at the top of the coil wires before they hide beneath the wiring harness. You´ll see two wires. One is red/black, the other Yellow/blue. Just tap in and you´re done.

Check out the photos.

[image]
This first photo shows the wires that control the tach.

[image]
This was what I used for a ground. I had to extend the ground wire about a finger´s length. Also, GREEN is the ground wire. You see black because that´s the color I chose for my extension.

[image]
This is the wire that you use to get the necessary info into the tach itself.

That´s that. Now go add one to your scoot.

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Re: Swapping out stock gauges - RESOLVED w/ pics
« Reply #15 on Jun 30, 2009, 9:42pm »
Here is a video follow up.

View My Video
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Re: Swapping out stock gauges - RESOLVED w/ pics
« Reply #16 on Aug 14, 2009, 7:53pm »
OK, reviving an old thread here. I have the same dash as Johnathon. My tach wires are black, green and yellow/black as well grounded the green, power to the black, my coil only has two wires off of it. When I touch my extension off of the yellow/black to the wires off of the CDI to test, all but two (the two solid Black ones) kill the bike when I touch them together. Could I need to switch the yellow and black? ie: power to the yellow and black to the CDI? This really should not be to hard, proly something I am doing wrong. Thanks for the help as allways.
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Re: Swapping out stock gauges - RESOLVED w/ pics
« Reply #17 on Aug 15, 2009, 7:06pm »
Rock on!! Got it to work thanks for this thread Jonathan. Issue is, it does not seem to register until about 2k. idle does not register at all, any ideas?
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2007 Vento Phantom GT5 150cc(now 160cc w/59mm kit)
Iridium plug, MRP coil and CDI
UNI Filter and NCY Performance Exhaust, 28mm FS carb
LED forward assist lighting and LED ground effects
Tail Mods and removed stock air box and all CARB crap including a new head with no EGR valve. And a bunch of other sh!t!!
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Re: Swapping out stock gauges - RESOLVED w/ pics
« Reply #18 on Sept 30, 2009, 8:15am »
Mine registers just fine. At crank up, it shoots up to 2100rpm and then settles around 1900-2000rpm.

Make sure you have a good connection on the coil wire, or maybe try the OTHER coil wire?
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