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am guessing that these pumps can produce 'spikes' in excess of that because the bourdon tube in the gauge ruptur
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Yes they can, I installed a 100 psi pressure gauge in line with mine into a 24 oz accumulator, and each time the pump stroked, it would pin the gauge hard, I'm guessing well in excess of 150 psi. It broke the gauge after only about 5 minutes of use. If you use a line pressure gauge you will need a substantial restrictor to control the pressure spikes.
One techinique I've seen used is to screw a fine thread allen set screw into the hose leading to the gauge. There will be enough leakage past the threads to give a pressure reading but the pressure spikes will not get past the high restriction.
I will be trying such a set up soon on mine, but need to go buy a new pressure gauge first.
Larry