I have a 75 450sl. I installed a Crane ignition upgrade. I removed the old control box but don't know which wire controls the tach. Can you help? I need the tach working before I can set the timing.

cg

The diagram on the cd is so bad I can hardly read it but it looks like the gray/yellow or maybe green/yellow is the tach.

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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

I couldn't read it either.

Craig