6000 RPM tachometer gauge for marine 6 cycle outboard boat motor

Vintage 6000 RPM tachometer gauge for a 6 cycle outboard boat motor. It has a brass housing and is marked with ''6 CYC O'BRD'' the number ''6468 285'' ''AC'' and ''Made in USA'' on the back. It measures about 3 3/4" across.

There is a partial wiring harness, but no engine speed pickup or sensor, just the gauge.

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Item No. b530168