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Just be aware that installing a third pickup will introduce more magnetic pull on the strings which MIGHT introduce fret buzz with low action, depending on the condition/properties of neck and what types of pickup you use.
I'm not saying this WILL be a problem but it MIGHT. Especially if you normally set your action for the lowest you can get away with. I would at least avoid pickups that are known to have particularly strong magnetic pull.
I'm not saying this WILL be a problem but it MIGHT. Especially if you normally set your action for the lowest you can get away with. I would at least avoid pickups that are known to have particularly strong magnetic pull.