I need to construct a speedometer that works off front wheels of a rear
wheel drive  automobile. I am considering using either a 16f84 or a Basic
Stamp. I have worked with neither. I have worked with HC11's though.

The first thing the meter needs to do is turn on a light at two different
speeds, at about 40mph and again at about 80mph. That is all I need to begin
with.

Does anyone have a source for the software that I might adapt. Or, could
anyone send me some source for a timing loop that will time a pulse with a
maximum width of about .75 secs. for the 16f84.

When I get the meter working as described above, I would like to be able to
log the pulse events from the front wheel sensor for the first 60 ft from a
standing start. Then download the pulse event log to a laptop to graph it.

Any and all help would be greatly appreciated.
Thanks
John