I hate the 65 Instrument cluseter and love the 66 so, is it Possible to switch a 1965 Instrument Cluster to the 1966 5 Gauge Cluster, and is there alot of work involved or is it just plug and go and what all would I need to complete this conversions.

 

I dont think its plug and go. Your instument cluster has idiot lights for oil pressure and temp. The "newer" style has gauges and they require sending units to activate the gauges. It can be done!

 

Asside from the additional wiring, you will also need to enlarge the bottom center of the dash opening to occomodate the 66 speedo.