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If you have no tach then you probably have no engine speed signal. If you have no engine speed signal to compare to the compressor speed, Klima shuts off the compressor.
The engine speed signal is made by the EGR transducer. The EGR transducer is powered by the OVP relay if I recall.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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