Here's the original thread on the conversion I started on 6 years ago and haven't finished...
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=847088Pictures can be found here (webshots links don't work)
https://photos.app.goo.gl/ymvcGhwf2G7W2FVXACan't seem to find the model number right now, but believe it was a VDO "Vision" series, about $50 on ebay at the time. (edit) try VDO 1211012341
The tachometer part number is vdo 1211002485 if you want to make a second speedometer housing into a tachometer the same way.