The OEM vacuum switch and the right brake pedal switch will handle the converter lockup duties without getting into the aftermarket ripoff stuff. There's nothing better than what the GM engineers designed in the first place! The vacuum switch, brake switch, and valve body switch need to be in series, so all of them are closed to energize the TCC. There's also a sneaky little trick on the valve body switch- - - -raising the converter clutch lockup speed by installing a higher pressure switch will prevent "chuggling" in and out of lockup at city driving speeds. The closing PSI of the grounding switch on the valve body roughly corresponds to MPH, depending on the rear axle ratio.
Jerry

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!