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Re: '97 Ultra no tach revisted
Your symptom sounds consistent with a flaky crank position sensor (CKPS) and it is possible no DTC error codes will set triggering a SES/CEL Mil light. The 18X pulses from the CKPS are also used for the tach processed by the ICM. Also, it would be a good idea to get the Ignition Control Module (ICM) tested.
The special tool needed will be a harmonic balancer puller with specially threaded and sized bolts to fit your harmonic balancer. The 18X CKPS is located behind the harmonic balancer.
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