Gary Goers sells also the rubber hose and says: " .. you must use your original nut at the oil press gauge since it has an oddball thread that is not available. A new crush sleeve is provided " . # 537 A on catalog (57-59 oil oress gauge line); 15.00 $ On my car before restoring it there was a leak at the gauge fitting and i had drops of oil on my shoe .. The gauge is exactly above the accelerator pedal ! I replace it with a gauge line from a wrecked Imperial. This hose (1313 643) is also used on Chrysler and nut / sleeve / elbow / are identicals on all '57 Mopar (i haven't the 58-59 parts manual). It seems you need also 657039 elbow and 137396 nut -- Philippe COURANT (Pau, France) Imperial 57 Crown convertible Buick 58 Roadmaster sedan - American Car Club de France (ACCF) : http://www.accf.com - Chrysler Imperial France : http://www.ifrance.com/c-i-f - Cadillac " Standard of Excellence " : http://www.ifrance.com/accf-cad - SportsCars : http://www.ifrance.com/accf-sprtcar