This is what i would do

-- first thing i would get a wiring chart for the ecu and see what pin the VSS goes in to then get a Volt meter and have someone ride with you and see if shows and pulse there should be 4 pulses per rotation. if there is not a pulse

-- next thing to do is on the back of your cluster there is two screws under the speedocable one has a + and other has a - put it on the + this might be alittle weird and be safe have someone drive the car and hold it on there an see if it pulses if not sounds like a problem in the speedo cluter its self if i am not mistaken thats wher the ecu gets the VSS pulse from

- i had a crx and had the same problem and it was my cluster cause i was using the VSS to engauge Vtec when i did a SOHC vtec swap.

just my thoughts hope they help