I put this VDO clock (2" hole) in my two 80s vintage Plus 8s, direct to battery connection and looks good. I put it to the left of the steering wheel, LHD cars. Got it from Summit Racing Equipment on the web.
VDO-370155 Clock, Vision Series, Analog, Electrical, Each
(Mfr. #: 370155)
$42.31 (USD)
I can take a picture if you are interested.
Cheers,