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EXCHANGE ORIGINAL SPEEDOMETERS

Speedometer Calibration 

Should you wish to have your speedometer calibrated to suit your car, proceed as follows:


Ensure the rear tyres are at the correct pressure. Disconnect the speedometer cable from the instrument and attach a paper clip to the end of the inner cable. Push the car forwards a little to take up any backlash. Mark the road vertically down from the centre of the rear wheel and push the car forward 6 turns of the speedometer cable. Again mark the road directly below the centre of the same rear wheel and measure the distance between these marks in metres. Then apply the following formula, where D is the measured distance in metres, and Tm is the final number of turns required for miles per hour instrument.

D x 1.09361 = Y.
Then: 10560/Y = Tm (Turns per mile)

Should your instrument be a KPH version, convert Tm to Tk (Turns per kilometre) by multiplying Tm by 0.6213712.

Provide us with this number and your speedometer can be calibrated to this figure. The part numbers below are used for our exchange speedometer units.

If you have an MPH speedometer and would like it to be refaced and converted to read KPH (or vice versa), we can do this too at extra cost. The cost of changing the instrument mechanically is covered in the overhaul cost, the refacing of the instrument attracts an additional cost. See RTR8585 below. 

 

Axle ratio 

The Axle ratio affect's the reading of your speedometer as the drive for the speedometer is taken off the back of the gearbox (or overdrive if fitted) which is before the axle in the transmission chain.


You can check what axle you have in your car by jacking up one wheel and whilst tuning this free wheel 10 times counting the number of times the prop shaft rotates. With only one wheel tuning this will be double the real figure as the differential will operate to account for one wheel being stationary. So if the prop turns 82 times the axle is 4.1:1, if the prop moves 74 times the axle is 3.7:1.
3 results found.
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  Part No. Description and Comments Price Add to Cart
108192EX

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MORE INFO

SPEEDOMETER MPH TR2-3B EXCHANGE

Revington TR information: Exchange domed glass TR2-3B Speedometer. We offer this service as an exchange for your old instrument, or we can refurbish your instrument if you prefer. Part number 108192 was in fact Triumph’s part number for a... READ MORE

£330.06

Ex VAT @ 20%
£275.05



Available to order
108193EX

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MORE INFO

SPEEDOMETER KPH TR2-3B EXCHANGE

Revington TR information: Exchange domed glass TR2-3B Speedometer. We offer this service as an exchange for your old instrument, or we can refurbish your instrument if you prefer. Part number 108193 was in fact Triumph’s part number for a... READ MORE

£330.06

Ex VAT @ 20%
£275.05



Available to order
RTR8585

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MORE INFO

RTR Upgrade

REPRINT SPEEDO or TACHO FACE

Revington TR information: This part number covers the cost to reprint the face of a TR2-6 large instrument, speedometer or tachometer. This includes the refacing element of changing a speedometer from Miles Per Hour (MPH) to Kilometres Per hour... READ MORE

£186.54

Ex VAT @ 20%
£155.45



3 results found.