I am sure someone has done it but its not a great idea for several reasons; first being on the console is exceptionally difficult to see especially if you are getting on it, second is that the cost of replacement consoles makes the idea of drilling a hole or holes into one not very appealing.
All this said, over the years i have mounted them in several places on E bodies;
- the classic steering column mount
- I mounted an autometer tach in the far right corner of the instrument cluster area (outside of the cluster, under the light bar) on a Cuda. That worked pretty well
- I have a hood tach (factory Direct Connection unit) on a car for a little while, I really like it for using it for power shifting because it is directly in the line of sight, down side is that I never did like the way they looked on the car.