can you get oil temp to show on your a/c display? code 1c as per below:
undocumentedacdiagnostics - mikefocke2
othwise, plx sells a lcd gauge that plugs into the obdii port, can read/display multiple parameters at once and has a customisable display. if you google 'boxster gauge pod' you can find a unit that mounts on the steering column quite easily.