No pot in the 380's, it's all mechanical.
Conrad, if your tach is not working right, you could have either a bad wire or a bad ignition control unit. The fuel pump relay will shut the pump off if it does not get a signal from the ignition unit, and this is the same signal that makes the tach register. Ask your mechanic about this.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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