John.. Little problem I see is My car doesn't have an economy gauge . I thinkt hey stopped using those for the 1990 model year.
So my question is can I tap into any old vacuum under the hood? Routing them isn't my issues its the type of tubing to get and the connectors.
The switch has what appears to be 3 vacuum connections to it. is one for each headlight and one for vacuum input? I'll read up on that article like you mentioned.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.