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Timing chain, not a belt.My guess might be a fuel pump. Check gauges light wont come on related to the tachometer. It would have been oil pressure, engine temp, low or high voltage, but not the tachometer.
The reason there are so many Ruger upgrades is because they're necessary.
Tach going crazy like that could be a symptom of an alternator producing low voltage. If fuel pressure related I would suspect a failed pressure regulator (too much pressure).