cranks but doesn't start. while back RPM needle was erratic but performance OK

What is your question?

Drove it to work just fine other than the RPM needle kept moving up and down and sometimes stayed on zero with no noticeable change in performance. When I got off work, the car wouldn't start at all, however will crank. fuel pump works, camshaft turns, so timing belt should be OK. all fuses are OK. I have had the car for 6 years but never change anything on it-spark plugs...etc.