Just buy a 1/8" npt Guage and drill tap with some pipe dope. If there's not enough meat where you can put it, just drill a hole and thread a nut on the back side with a piece of rubber creating like a gasket.
To be honest, the most practical way of gauging when to clean is to monitor the output force of the water coming out compared to the force when it's clean.
I agree with FUBAR and Pool DV. I ignore my guage most the time. I just check the water flow coming from my return. If it slows, I backwash. In your case if it slows, change your filter.
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