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#1
09-03-2012, 11:06 AM
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Tach amp,
The rev counter in the instrument cluster does not work.
I have found the tach amp, but reading other posts here about a temporary fix, what I am looking at doesn't quite match up... I have a w123, 230, 1982. When I unscrew the 'lid' of the tach amp (the black plastic 'bin')... Should there be anything there? The 'lid' is emtpy... Or am I looking in the wrong place at the wrong thing..? 
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#2
09-04-2012, 08:46 AM
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Gas cars do not have a tach amp, only turbo diesel cars.
The RPM signal on a gas engine is sent directly from the ignition module to the fuel pump relay & then to the tach
__________________
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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#3
09-04-2012, 12:12 PM
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You might have a break in the signal wire going to the tach, might not have power to the tach, or the tach's capacitors have failed.
You will have to pull the cluster to find out more.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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