While playing with this datalogger, I've got some cool graphs and I've got the RPM sensor working now. Just have the Rear Wheel Speed sensor to make up to have it fully operational.
I was taking 1 sample per second to see if the programming worked (it did) but have now changed the code to take 1000 samples of each channel per second, taking the average value to get an accurate value to store.
This is limited by the registors in the microcontroller as to how large a value I can get before I divide by 1000. I used 500F as the value to decide this ... hopefully the heads will never reach 500F
Sandeep