The display in the unit is not on the PCB, but connected to the main PCB with a 16 pin cable. Unfortunately this cable cannot be longer than a few inches. The serial display we are working on for the car-mounted unit will also work with the current hand-held unit. It connects to the serial port of the unit and draws its power from there too. The cable length then is up to 10 ft between unit and display. This remote display has the Record button also built-in. The 'Calibrate' button stays on the unit itself because it would otherwise be too easy to inadvertently calibrate to exhaust gas instead of free air when somebody hits the button by accident.
The target size for the planned unit is 1.5 x 3.5 inches. You can take this unit out of the housing and permanently mount it in a gage cluster. Digikey even sells a good looking black plastic bezel that fits the display. Contacte me for the part-# when the time comes.
To configure your LM-1 to use the new display all you need to do is to connect the LM-1 to your computer, run our included software and click the 'serial display' button to change to unit to serial display mode.
My suggestion of using a digital panel meter would give you a nice BIG LED display (like the LambdaBoy display) if you want to. These panel meters are typically voltmeters 0-2V with the decimal point set by grounding the appropriate pin on the meter. This would be ideal as direct AFR display using one of the analog outputs.