90CS Quattro V6-2.8L (AFC) (1995)
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Tachometer: Testing and Inspection
Engine speed (RPM) signal, checking
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Remove instrument cluster. See: Instrument Cluster/Service and Repair
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Disconnect yellow 26-pin harness connector from instrument cluster.
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Connect VAG 1598/4 adapter between yellow 26-pin harness connector and instrument cluster.
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Connect adapter to VAG 1598 test box.
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Set digital multimeter (Fluke 83 or equivalent) to AC Volt measuring range.
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Connect multimeter between test box sockets 8 and 22.
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Start engine.
Specification: 7 volts, depending upon engine speed (RPM)
