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2003 G500, 2000 SL500, 1995 E320 Cabriolet, 1980 TR8
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1,109 Posts
I believe the tach signal comes from the EZL on an 89. The fuel pump relay merely uses that signal to decide whether to run the pumps or not.
 

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1995 e320ce. 1993 230 TE. 1987 Kit car with 260e running gear.
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708 Posts
Yea, goes to a lot of places, according to my Haynes wiring diagram but elz must be the source.
 
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