If you like, just copy & paste these speedometer pics on a Word page, shrink them down to size, and print them on photo paper. I found them by doing a Google Image search:
I usually paste several copies of each gauge, each at a slightly different size... one of which should be sized correctly.
VDO gauge:
The same deal works for small stuff such as licence plates, etc. You may luck out, meaning if the speedo diameter happens to be 1/4", use the same size hole punch to cut out the image, and glue to the dash.
EDIT: Sorry, the pics were moved to another Fotki folder. Just Google Image: "VW Beetle speedo".