I wasnt thinking of something screwing into the line rather not having the line at all have an electric gauge in the cluster like later model benz's. and have a sending unit on the engine somewhere.

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1982 300D Turbo (Mom's)
1993 BMW 525I (Dad's)
2001 Vw Golf (Brothers)
2002 Nissan Ser SpecV (Im the Black sheep lol)