I would like to add something to Freds excellent idea. You need to work from the center section of the car. The first two gauges should hang from virtually the rocker panels. Using the rear could give you a false reading if say the rear was damaged too. Ultimately you would have 4 or five of those gauges and reference off of the two gauges hanging from the rocker section. Lining up the pins on the center section and checking the rest from there. It takes a little eye coordination.