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My 84 has a vacuum switch mounted on the firewall that controls the automatic transmission's lockup convertor. It appears to have (2) switches in it, one to kick out convertor if vacuum is too low (acceleration) and one to kick out convertor if vacuum is high (coasting).
I think switch is failing and "window" between low and high vacuum is getting too small.
Does anyone know where I can purchase a replacement for this switch? (I guess I could use to (2) separate adjustable vacuum switches, but would like original style switch if still available from somewhere.)