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Oldsmobile alero tachometer and security issues
So my girlfriend has been having some issues, suprise! First off, when you start the car the tachometer (rpm gauge) goes all crazy! It starts just fluctuating from 0-7 without affecting the engine. Secondly, the security light is on but the car starts up just fine. The odometer also switched to KM instead of miles. She tried to drive the car this morning and said that it was stalling and cutting out.
I've replaced the battery and checked the fuses thus far and still the issue continues. I heard it could be the cluster ($300 repair!) or possibly the ignition switch? I don't know, so I was hoping someone has ran into a similar issue and figured it out.
Also here's a link to a video of the occrance: