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Most people don’t test them first. I just swapped the new ones in. But if you insist, put them in a rail that fits this type of injector since you probably do not have any other type of injector holder (you may not have any rails, either) and apply 12V and touch the other wire to ground. Of course this won’t tell you much other than that the injector sprays. What a worrier or someone very thorough would do is send the new injectors out to an injector tester to test flow and spray pattern. I have done this before.
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