LandRoverAnorak wrote:

I'm pretty sure that a having only a GPS speedo isn't legal. Something about type approval and being physically associated with the car springs to mind. It'd certainly be worth checking before spending lots of money

Quote:

Speedometers

Fitting

Regulation 35 Road Vehicles (Construction and Use) Regulations 1986 states that every motor vehicle shall be fitted with a speedometer except:

a vehicle having a maximum speed not exceeding 25 m.p.h.,
a vehicle which, at all times, is unlawful to drive at more than 25 m.p.h.,
an agricultural motor vehicle driven at not more than 20 m.p.h.,
a motor cycle not exceeding 100cc first used before 1st April 1984,
an invalid carriage first used before 1st April 1984,
a works truck first used before 1st April 1984,
any vehicle first used before 1st October 1937,
a vehicle fitted with an approved tachograph which is required or not.

Vehicles first used on or after 1st April 1984 the speedometer should be capable of indicating the speed in miles per hour and kilometres per hour. Vehicles may instead comply with EC Regulation (Community Directive) 97/39 or ECE Reg 39.
These directives stipulate the markings, graduations of the speedometer and refer to 75/443/EEC which specifies the tolerances.

The indicated speed must never be less than the true speed (it must read exact or high) and between 40km/h and 120km/h the error must not exceed 10% + 2.5 m.p.h. high (true speed/10 + 4kph).
This means at a true speed of 25mph or 40km/h the speedometer may read 40/10+4 = 8km/h or 5mph high = 30mph indicated.

Maintenance

Regulation 36 Road Vehicles (Construction and Use) Regulations 1986 states that the speedometer fitted to a vehicle must be kept free from any obstruction which may prevent it from being easily read and shall at all times it is used on a road be maintained in good working order except if:

the speedometer became defective during the journey being undertaken, or
steps have been taken to have the defect remedied by replacement or repair with all reasonable expedition, or
the vehicle is fitted with an approved tachograph which is required to be fitted under the Community Recording Equipment Regulation (offence is under that regulation).

GREENI wrote:

I'll take that risk. It's physically attached as it will be bolted in the dash!
It will be more accurate than the wavy needle that did work and if they can prosecute you using 'radar' technology.....
I'm not fussed to be fair.

By 'associated with', I meant that it's reading is related to it's connection, i.e. electronic or mechanically driven. However, as long as you know and are happy with the risk then that's fine  Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia