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The 1984 & 1985 cars don't use the amplifier! The 1984 & 85 cars use a FLYWHEEL ring gear sensor that produces A/C current. The 1984 tach operated directly off of that signal.
The 1985 car has a computer that processes that signal & then sends it to the tach & a/c compressor relay. Many times if the tach is inop the overvoltage relay fuse is blown form jump start OR battery replacement. The OVPR is behind the rt outside dash vent.
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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