Gary
I know this is something it appears you do not want to do, but this is what we did.
Our car did not have a clock. Therefore, I ordered a Jeep CJ tach and placed it in place of the clock. I had to do alittle modification on the dash support, but with the cover installed, you can not tell the difference. As well, the numbers on the tach look very close to the mustang numbers on speedo. Most people can not even tell the difference and allows us to have a tach and utilize an area not utilized.
I know what you are asking about but can not help you as we decided to go this other route.
Paul