Speedo Running ''Slow''

['68OrangeSunshine]

I call the three periods of the '67 thru '72 Chevy Truck Run, Phase I 1967/68, Phase II 1969/70 and Phase III 1971/72.
I like to keep my Phase I Orange Stepside period correct. Although a 1969 Thunderbird bucket-back bench seat [electrically adjustable] is pure fantasy hotrod. But for the rest, it's still a simple fleet truck.

On the '71 GMC Jimmy, I have long plotted to make some of the interior more First Phase like. Primarily so I don't have to think about which year truck it is while dealing with traffic. Last year, I pulled the '68's Wiper knob off in my hand trying to turn on the headlights. [Thinking it was the '71] So moving the '71's Wiper over to the left, and lowering the Headlight swiitch is planned. A retrofitted Manual Choke is already on the right. Adding Manual Throttle will be difficult. I have the Knob and Cable but getting it to actuate is beyond my technical expertise.
I have a spare 3-Spoke 1st Phase Steering Wheel and GMC horn cap, so that would drop in place.
The gullible may deduce I have a '68 MY Jimmy when that all comes about. Not sure how I'll handle that. Case-by-case is best. An expert will know it's modified.
I don't mind being thought of as a Smart A$$, but don't want to be a Liar, either.
I guess like Johnny Cash would say,
''It's Sixty-Seven, Sixty-Eight, Seventy, Seventy-One General Motors Automobile...''