Replacement Speedo

[PatM20]

Hi,

Can anyone recommend a replacement speedo that is geared for a 61 swinging arm. Not too worried about total accuracy, but something that tells me I am around 30 mph would be a start.

I don't have the funds to justify anything other than an Indian copy at the moment.

Regards

Pat

[PatM20]

Sorry, forgot to add "and Ammeter".

[Brian]

If you are not worried about originality what about something like this

https://www.ebay.com.au/itm/200KM-H-Car-Motor-Auto-Stainless-GPS-Speedometer-Waterproof-Digital-Gauges-AU/122862059881?hash=item1c9b264169:g:f-4AAOSw5eFZbs9S

100% accurate but you need to be running a 12volt system. No drive required.

[PatM20]

Hi Brian

Thanks for this. Never thought of a GPS speedo.

I was going to set up the bike 6v positive earth, though the E3L probably pushes out in excess of 12v even on a 6V winding.

I haven't bought a regulator yet so not wedded to positive or negative earth. Was going to fit a DVR2 which will work 6 or 12v, but is polarity sensitive.

Can I put in a 6v to 12v power inverter?

Regards

Pat

[Bsareg]

I've used a cheap (£4 I think ) 6 to 12v inverter from China to run an LED headlight, so I would have thought it would easily run a GPS speedo.

[PatM20]

Thanks BSAReg.

I put 6V LEDs on my M20. Lots of light, but no focus. Going above 10 mph was really dangerous. I was really disappointed.

The headlight was OK if there were street lights, but useless in total darkness.

How have you got on with yours?

Regards

Pat

[PatM20]

Forgot to add, does the step up inverter need negative earth?

[Peter in Aus]

If you just want to know your speed fit a push bike computer. I use a Cateye Velo 9. It has to be a wired one as wireless ones wont work, to much interference.
It can be setup to be very accurate, I set mine up on a section of road that had a measured Km.
The default setting is very close to being right and would be near a enough.
Peter

[ChasF]

The ‘best of both worlds’ option would be a bicycle gps speedo which runs on it’s own internal battery. Better still, if you have a smartphone, would be a mounting bracket and speedo app. for it.

[Triton Thrasher]

Forgot to add, does the step up inverter need negative earth?

It’s almost certain to have two 6 V input wires and two 12 V output wires, so no.

[PatM20]

I am a bit confused now.

For example, if my dynamo, battery and voltage regulator is set up for positive earth and I fitted a 6v to 12v step up inverter would I be able to use a 12v negative earth LED headlight bulb or (not that I am going to) fit a 12v negative earth radio?

My concern being that if a GPS speedo needs to be negatively earthed, then I might break it. I can always polarise the dynamo to negative earth to make things easy and fit a negative earth regulator.

To be honest, I was hoping that someone would come back and say a cheap £20.00 replica with a 2:1 ratio will be about OK. I just don't know the correct ratio for an A10.

[berger]

no i was given some leds and my bike is 12v positive earth the leds were negative and dont work on a positive system, and i couldnt be arsed to change everything just to fit them, so i opted for a 12v 50watt hallagin as  daylight riding light that works without having the back light on, leds are either positive or negative earth

[Bsareg]

Cheap led headlight are a waste of money except as a daylight warning to other road users. There are much better ones (that will throw a beam)  available,  but at the moment they are very expensive. Give it time before buying one, the technology is getting cheaper.

[Greybeard]

Surely, (stop calling me Shirley), as long as the device, (GPS or LED) is insulated from the machine you can feed it with + and ground it with -. No?

[berger]

i dont think you can confuse a battery with oposite flows of current by doing that, and i want one if you can, its a new one on me