Thanks Hans and Matt,
Indeed there was a screw underneath the leather that I hadn't yet found. Once it was removed, each corner was easily removed. I'm now ready to re-coat the leather.
One additional issue - my gage cluster (oil, fuel, temp) is foggy and I wish to clean the glass. I can't find anything on the forum about this. The chrome bezel surrounding the gage seems to be held by bent flanges. Is the best way to access the glass by bending these flanges open? Seems unlikely I will get it re-bent back as properly as it is now. Thanks in advance for any advice you can lend.