I installed a 3rd party cruise Computer (also did cruise control): Zemco Compucruise on a 1972 Winnebago Brave back in the 80's
If you installed on a Manual Transmission car, there was a 'drop out switch' chain that attached to each pedal instead of just the brake pedal. As long as there was tension (pedals fully released), the cruise control was permitted.
This did not fully prevent 'Lugging', but a Wide open throttle condition for very long, would result in it dropping out of cruise .
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