Hey guy's,

Jim B. love the wheels on the car PM me with what you suggest for price, might be it might be that I'll replace.

Indianajo
The board contains a vacuum device (really simple unlike the way we in the US think) that when sufficient vac or pos pressure is generated the contacts trigger a signal to an IC to shut the pump motor off, I'm sure that it also has a time limiter to shut off in case a preset time is exceeded.

A.

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Adriano

83 300SD 500,300 miles (Well seasoned work horse AKA "Put Put")
93 300D 245,000 miles (Moms Baby AKA "Sweat Pea")
87 300D 185,000 miles (Life giver, aka parts car for my 300SD)