Maybe I am going about this whole thing wrong. The pulses that come from a vehicle speed sensor should be able to be converted into into a straight d.c. voltage with the addition of a capacitor. That way the program doesn't have to wait through a count statement, it can just read the voltage from an adc port and make adjustments. Of course the adc needs a short pause itself in order to operate correctly. Its either that or have another chip doing all of the counting and sending its info to my pic. (sounds pretty deep to me).