Each page has a display-update subroutine. Write your subroutine, then add it to the array:
Code:
const fptype LEDrenderPage [numLEDpages] = {&LEDnumBlankDisplay, &LEDnumOdoDistance, &LEDnumVehicleSpeed};
... and make sure:
Code:
#define numLEDpages 3
is correct.