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Q:

Jeep starts, but will only run a couple seconds. None of the gauges work. on 1999 Jeep Grand Cherokee

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A dash light came on that is a "key with a slash" through it. I believe this is the security system symbol. The remote key fob will lock & unlock all doors but the drivers door.
(1) Answer
There is a chip in your key that keeps you car from being stolen, most likely your key is bad. Search sentry key problems and you maybe able to come up with some more, have you tried using your second key?