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The gauges before the first filter will tell you if the first filter is clogged (and if so, the relief should open). The one at the end is to gauge drop across the filter media to gauge hoe clogged the media is. You *could* get away with one at the front, but its much more accurate to get a...

PVC pipes are not really an issue if you add in a relief valve that will dump back into the pumped tank. But the cost of PVC really doesn't save you much over iron/brass fitting. Fit the relief valve after the motor and before the first filter. Gauges!!!! Before the first and after the last...