My guess is that it is the pulse type, if this is the case then it should be very easy to interface to the serial port.

Once the connections are made you would need a piece of calibration software which simply counted and displayed the pulses over a 5 mile drive (no wheel spins now!).

Once you have this, in conjunction with the inbuilt clock you can calculate:

Distance
Speed
Acceleration
G- Force !


Oh, and adjust the volume as originally requested.


PS. I see that you are looking for an AR Red for your new beamer, I will swap mine for the blue you have if you want.


MK2 Red S/n 949