Hi Robbie, the calibration mode is selected by switching on the ignition while simultaneously holding the "trip counter button". After +3 seconds release the button and the speedometer digits will flash. For safety, write down the number you see on the display.
First test the accuracy of the meter, noting the difference between 10 miles on your display and 10 "real" miles on the motorway mileposts. Or time your speed over a set distance and a fixed speed. Then I used the "rule of 3" calculation to get to the correct pulses/mile (might take a couple of changes till you get to the best one, but you can try unlimitedly).
By momentarily pressing and releasing the reset button each number (starting from the left) can be incremented to your calculated value. When the desired value is selected wait a couple of seconds till the next digit will flash, increase this number, etc to the full pulse setting. At the end of the reset, wait another +3 sec for the speedometer to return to normal operation.
Well, this is how it worked for me anyway. Up to you...
