It's built into the throttle linkage in the transmission- - - -totally hydraulic, no electrical component at all. There is a piece of linkage from the carburetor quadrant to the transmission. The radius of the pivot ball connection at the carb to the throttle shaft is pretty critical to the proper shift sequence, as well as the kickdown function.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!