I never used the ashtray on my 300E so I installed a couple of extra gauges in that space, VDO voltmeter and oil temp gauges bought on ebay (removed from an 80s Audi). I used the ashtray housing and bolted in a VDO bracket to hold the gauges. Looks pretty good. If you weren't lazy like me you could cut the wood on the ashtray to fill in the small gaps between the bracket and ashtray housing. Plan to install a 12V socket in the glove box if I ever need it to charge phone or something. Will post pics later.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car