Since your original message discussed a Wheatstone Bridge I'm going to assume you are referring to matching the legs of the wheatstone so they are balanced. For the two segments that are not part of the sensor based voltage divider you can use 1% precision resisters or you can sort through a large number of resistors of the same nominal value replacing one at a time in the Wheatston Bridge until you get a match that is close enough. The other possibility is to use potentiometers and adjust until balance is achieved.