I found the same cluster of vacuum lines. I am leak testing them today.

I am able to suck down the lines downstream of the vacuum switch and then the dash switch will work but will not work again after restarting engine

Will test more today to find fault


I

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Jeff (moose)

92 500E 90K miles stock less AMG chip

73 Datsun 240Z, 74 260Z, and a 75 280Z 2+2