mossieramm, the Luftwaffe colour coded certain instruments with red, yellow and white around the bezel, and this might go someway to alleviating the drabness of the RLM66.
For more information try:
www.luftarchiv.de
The site is in German, so look under 'Bordausrustung', then from the next menu go to 'Fluginstrumente' and go to the foot of the page for images, some colour of various cockpits.
Hope this helps.
Karl