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It looks like the wire is plugged into the oil sending unit plug where you will have voltage when the key is on. The voltage will not change to this connector when the A/C is turned off and on if it is the oil sending unit and can be checked by listening to the solenoid or using a test light when you turn off and on the A/C and/or ignition switch. They may have put the solenoid wired this way to give extra RPM when running and when you turn off the ignition it will shut off without dieseling (otherwise, the idle screw set to high to give a stable idle speed).

Depending on the transmission, for example the th350 will have a kick down cable that would go from the passenger side front of the transmission up to the carb. If a th400, they use an electric kick down. Hope that helps.
 
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