1mm seems like way too much gap for a magnetic pickup. As 97SL mentioned earlier up in this thread, the gap is typically in the thousandths of an inch range (fraction of mm). If the tap is too wide, you'll get no reaction out of it until the RPM is high enough keep it triggered. The voltage pulse is tiny, getting the right amplitude out of it is all down to the gap.
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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)
Black Sheep:
1985 524TD 167K (TotalDumpster™)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
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