Why does my engine light flashes above 65 MPH (above 2500 RPM)

What is your question?

Ever since the dealer replaced my instrument cluster, the engine light will flash above 65 MPH if driven at a constant speed (random misfire). If I drive at various speed going from 60 to 70 back and forth, its fine. I took it to the dealer (another), and they can not find anything wrong with it. I had them replace the wire and plug, still no help. One old mechanic told me that when they replace the instrument cluster, they did not recalibrate the crankshaft. Could this be the problem? Been driving below 65 MPH for the last year. Can anyone help?