Here's a 993 owner who put the concealed display in his tach. Nice.
http://p-car.com/diy/v1/remote/
I've often wondered if I could tear mine apart and mount the front sensor on the front bumper, rear sensor on my rear license plate, and the guts in the rear trunk or something.
Problem with this is that the beauty of the V1 is that it can be sent back for upgrades for a reasonable price and one could no longer do this if it was torn apart.