Universal 12v speedo? [UPDATE - use a satnav, thanks]

[Rogerborg]

[UPDATE SPOILER] Will probably just use a satnav and damn the Constabulary's eyes.

Not for me, for workmate's Hyosung. While the Electro-wizards pore over his digital dash unit and try to bring it back to life, we're looking for a cheap, (barely) legal speedo solution.

There are loads of cheapo sensor driven bicycle speedos around, but they're battery powered, only go to 99kph (his bike is red), smallish, and not backlit.

Does anyone know of the same sort of thing but without those limitations, i.e. lit, 12v, and capable of registering red-bike speeds? A cursory Google doesn't find anything, so I throw it open to the brain trust.
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[Vincent]

What's your mates budget?

Where does colour come into it He wants a red one to match his bike?
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Space Is Deep

[Vincent]

How about getting an old satnav just for the speedo part? Or a speed camera detector?
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Space Is Deep

[DrDonnyBrago]

[chris-red]

If it is temporary just use a £5-10 push bike speedo.
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[mad4it028]

old smart phone with gps ?
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[U_W v2.0]

are push bike speedo's and satnavs ect really a legal means of gaining your speed though? lol
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[Rogerborg]

Roundup answers:
Budget is as little as possible, since the original instruments might be savable.

However, they might not, so this might be a long term bodge.

Satnav is an interesting option, I hadn't thought of that.
[UPDATE] and he has an old one spare. Double

Legally, I believe that speedo is as speedo does. As it's not my bike, I can't be arsed checking the regs though.

[UPDATE] Of course I was going to check the regs, I'm kidding nobody.

[DrDonnyBrago]

[Marmalade]