For a riviting non-fiction account... I would recommend... "The Truth about Chernobyl" by Grigori Medvedev. You can pick it up for a couple of dollars. He is one of the engineers who built the place and one of the subsequent investigators. I'll guarantee that once the action starts happening - you can't put it down. This is THE one... all other books about Chernobyl pale in comparison (the one written by Piers Paul Read is especially only good for land-fill).

The only way is tight code. Say your Sensor measures one count per tyre rotation and your tyre is 65cm diameter. At 200km/hour your Ferrari will give you approximately one count per 36mS. Providing your count accumulation, math, saving and LCD display output can be done from start to finish in less than that time, you won't lose any counts. It is achieveable.

The problem you have is that the PIC can only do one thing at a time. If you really don't want to miss counts and your skill at coding is, let us say, "less than optimum", I would recommend two PICs with your sensor connected to both. One can give you continuous display, the other is continuously counting only. At the end of your journey the counting only PIC (which need only be a baby like a 12F) can on request transfer the total count to the other for display.

If you attempt to tinker with PBP's method of interrupts by inserting your own assembler code to guarantee you don't lose counts, you will almost certainly upset and corrupt the operation of routines like LCDOut.

Melanie