CALIBRATION
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SPEEDPILOTS

Speedpilots are adjusted by a screw accessible from underneath. The screwdriver goes in at an angle. Try to fit the unit so you can reach the screw without having to take the speedpilot out as this saves time when you are calibrating. The screw head turns a worm and wheel arrangement which has an enormous range of adjustment, but if the screw does resist, don't force it or it will jam everything up. The right-hand number on the odometer must indicate tenths of a mile or kilometer when you calibrate it. If you calibrate it to read units the pilot hand will move at 1/10th of the speed at which it should actually be going and your navigator will blow a fuse.

TWIN and TRIPMASTERS

These are both calibrated by changing cogs inside the removable panel on the left side: there are three brass cogs of which you change the top (largest) and bottom (smallest) ones, leaving the intermediate 55-tooth cog attached all the time. All Masters supplied by me come with the standard calibration cogs (141 and 32) fitted and you use these over a measured mile or kilometer to find the correct gogs for your car. I have a magic chart (thanks to Geoff Cooper) which tells me instantly which cogs you need to swap from miles to kilometers or vice versa.

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