I was trying to find someone that might know the dodge ram track sys. on a 1985 1/2 ton all off my vac. hoses are in tac but the one to the engine .Mopar has been little help but to say we can sell you a new vac harness for $200.00 . I even purchased a 85 service manual from them but it didn't help  I rigged a manual valve on it but it doesn't work the same    STUCK IN TWO WHEEL   this really sucks I have drove mopar's for year's