GPS Speedometer

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koncretekid
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GPS Speedometer

Post by koncretekid » Sun May 31, 2020 2:42 pm

Whoops, I meant "speedometer" and I can't edit the topic! (Edit by mm: Your wish is my command)

On my recently completed B44 parts bike, I needed a speedometer. Besides the cost of a working Smith's speedo, there are the speedo gearbox and cable to worry about. I noticed a post on Britbike.com by Mark Z about his GPS speedometer which might be of interest here. And the GPS ones like this Ellinger one I purchased thru Amazon are only about a $100. They are intended to be mounted on a negative ground system, but all you have to do is attach the blue wire (which is ground on a negative ground system) to your hot wire and connect both the red and orange wires to ground. The red wire is for the tach; the orange is backlighting. You could put a switch on the orange if you want to be able to turn off the backlight feature, but it's not necessary as the light in the tach will now indicate that the ignition is tuned on.

From a post on the Britbike forum, Mark Z also bought a mounting bracket made for standard 3-3/8" "Auto Meter" gauges. You can get a simple clamp-on unit or a fully enclosed model. But as I was too cheap to buy one, I made a simple flat plate mount that attaches to the handlebar clamps, but could be mounted on the triple clamps. I'm using OIF triple clamps and couldn't easily make one that I thought would be sturdy enough when mounted to the original headlight bracket mounts.

The annoying thing is that these units come with an antenna lead that is 4.9m long, or 16 feet, and are not to be cut. I ended up with the sensor mounted just behind the seat with velcro, and running the wire forward around the headstock and back to the seat post three times before it actually reaches the instrument.

I've only ridden it about 10km. but it seems to work great.

Image
Overall appearance

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Antenna wires wrapped around the headstock

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Mounting bracket made from .090" aluminum

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Antenna sensor mounted on rear fender

Tom
Last edited by minetymenace on Sun May 31, 2020 6:24 pm, edited 1 time in total.
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Re: GPS Speedometer

Post by Johnq1 » Sun May 31, 2020 4:25 pm

Nice looking bike, I went with a motogadget m-unit to wire up everything, expensive but neat,
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Re: GPS Speedometer

Post by JB » Mon Jun 01, 2020 9:15 am

Very nice looking bike :thumb

I really like the paint job on the tank, I normally prefer the BSA steel tank version to the Tr****h version you've used, but you've done such a great job with the paint curves that it works really well.

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Re: GPS Speedometer

Post by Jack Gifford » Tue Jun 02, 2020 5:38 am

Tom- is that a virtual needle on the GPS speedometer?
The GPS speedometer in my lakester has only a digital readout. I like the look of yours.
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Re: GPS Speedometer

Post by koncretekid » Wed Jun 03, 2020 11:25 am

Jack,
It's an actual needle, but of course, it only goes to 200 kph, or 120 mph.
Tom
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Re: GPS Speedometer

Post by tridentperu » Wed Jun 10, 2020 1:39 pm

Unit looks great, and I can see why the 120 mph limit might be a problem with the B44.............

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Re: GPS Speedometer

Post by SteveS » Wed Sep 23, 2020 6:16 pm

.
Hi Tom
.
Can you provide any further update on the performance of the GPS speedo? Thinking of getting one for my latest project but concerned about how easily the signal is picked up as the antennae is meant to have 'clear view of sky'.
.
This is the one I'm thinking of getting with built in tacho:
.
GPS speedo - 164321089228.jpg
GPS speedo - 164321089228
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Re: GPS Speedometer

Post by minetymenace » Thu Sep 24, 2020 2:13 pm

I think that speedo uses a standard GPS antenna. I has something similar mounted on an old van I had, it eventually succumbed to water ingress. Knowing the size I would be tempted to try to hide it under the seat foam, so unless your arse is made of mu-metal it should perform quite well.
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Re: GPS Speedometer

Post by JB » Fri Sep 25, 2020 1:00 pm

Steve, nice looking instrument, although from what I've just read in the instructions it would appear that the rev-counter functionality is for multi cylinder engines with 4 cylinders and above!
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Re: GPS Speedometer

Post by SteveS » Fri Sep 25, 2020 1:06 pm

Hi John

I didn't see that, thanks for pointing it out.
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Re: GPS Speedometer

Post by koncretekid » Sat Sep 26, 2020 1:16 am

SteveS wrote:
Wed Sep 23, 2020 6:16 pm
.
Hi Tom
.
Can you provide any further update on the performance of the GPS speedo? Thinking of getting one for my latest project but concerned about how easily the signal is picked up as the antennae is meant to have 'clear view of sky'.
I cannot provide any update because I have never been able to get the bike registered because the Dept of Motor Vehicles was shut down all summer. I applied for a title about a month ago, but I'm afraid my application got lost in the mail. By chance, I started it and rode it up my driveway and around a 3 acre field today. It wasn't working, but when I got back, I realized that the ignition wire from the battery had got disconnected. It kept running, even idling on the alternator alone. I even turned on the LED headlight and it came on but was flickering. Hooked up the wire from the battery and the speedo came back to life.

Tom

Here's a photo I took in June.
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Re: GPS Speedometer

Post by beat » Sat Sep 26, 2020 6:48 pm

nice swimming pool you have....

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