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Diesel cars require the diesel tachometer head, there is no substitute or workaround. The gas cars use the ignition pulse from the ignition module for tach readout, the diesel count flywheel teeth. Additionally, the tach pulse for the 603 engines comes from the EDS computer. If that wasn't transferred to your swap, you do not and never will have a usable tach pulse unless you get some sort of aftermarket tach setup.
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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