I have a book called Cockpits of the Cold War written by Donald Nijboer, it illustrates a number of cockpits from cold war aircraft including American machines. Look through the illustrations it appears that this type of Mach meter was fitted to the F86 Sabre. But please bear the following in mind.
1) Most instruments were standard fitted to a variety of aircraft and I doubt if this was exclusive to the F86, its highley likely to have been fitted to other types in that particular era.
Hope this helps.

Thats a great help, thank you for going to the trouble to look it up. The fact that it could have been fitted to quite a few different aircraft just adds to its appeal for me.