Pressure Gauge

I ordered the Pressure Gauge Glycerin filled 2.5" Rear Mount from TFTestkits.net and went to install it on my Krystal Clear 2800 GPH .75 HP. At this point is when I learned the intex gauge isn’t 2.5 inches but some size smaller (I figured they were universally sized, silly me). I don’t know what my best course of action would be; do I return it and if so how, is there a way to make it fit if so how? Really wish it would have fit, having a more accurate gauge would be nice.
 
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