How do you set the timing in a 91 s10 2.5 after you replace timing gears

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Under your dash you'll find your diagnostic plugin you have to cross the top fat right 2 terminals with a paper clip which will stop your computers variable advance hook your timing connector to #1 spark plug wire an the other connectors to battery loosen your distributor hold down bolt start the engine an adjust timing to 8 degrees BTC once you have it tighten the hold down bolt