Gently place the control unit inside the gauge and tighten the four
screws in the corners of the keypad. Turn the gauge on. If the gauge
displays Baseboard Not Connected, then the ribbon cable is not
connected properly. Check between the baseboard and the control
unit connector again.
If the gauge displays Incorrect Baseboard ID, then the control
unit is connected to the wrong gauge. The calibration constants for a
gauge are stored in its control unit; therefore, the control unit must
be returned to the gauge from which it was removed. To ensure that
this occurs, the control unit checks an electronic ID on the base. If
this error is displayed, return the control unit to the correct gauge.