I've seen your project shematics and I thik I can help.
I'm rather good at Delphi programming, specially for interfacing with some hardware.
It would be usefull to have more informations about the environment :
General project goal and purpose (vehicle, machine...)
The drawing makes me assume there is a distance constant to know to convert
pulses count into meters or miles. how much is it ? should it be customizable ?
about the inductive sensors, how are they connected to the computer ? (usb, serial, other)
is there an SDK needed for the interface, or a protocol documentation ?
Please, tell me more.