This is the instrument panel wiring diagram of the 1966 Oldsmobile 52 through 86 Series. We will break it down, what cars are included here;
The 52 Jetstar 88 Series are: Holiday Coupe, Holiday Sedan, and Celebrity Sedan
The 54 Series Startfire Series is: Hardtop Coupe
The 56 Dynamic 88 Series are: Holiday Coupe, Holiday Sedan, Convertible, and Celebrity Sedan
The 58 Delta 88 Series are: Holiday Coupe, Holiday Sedan, Celebrity Sedan, and Convertible
The 84 Ninety-Eight Series are: Holiday Sports Coupe, Holiday Sports Sedan, Convertible, and Town Sedan
And the 86 Ninety-Eight Series is the Luxury Sedan.
About the components, here are some of the components inside: wiper cable assembly, cable assembly power top, power top switch, ignition switch, ashtray lamp, headlamp dimmer switch, etc. (Click image to enlarge)