In industry with a pulsing load we used a snubber for sure. The fluid load in the press has a bit of a "pulse" when it goes from 600 psi low pressure travel to 20,000 psi when squishing a billet. BUT - that happens so seldom in the life of the press I don't see it as much of an issue, especially when the gauge costs $13 and the snubber costs... how much? Oh, just checked and they're about the same price as the gauge. I remember the snubbers purchased in industry and they were expensive, but the gauges used were a good bit more expensive than what I'm using also.
A rotary gear pump doesn't have as much pulses as a piston pump where the snubber would be more important.
You got the snubber, use it. It can only help. At only $11.56 maybe I'll install a snubber
https://www.amazon.com/dp/B01IT9EV80/?
Please do remember, the ONLY real personal hydraulic experience I've got is with my Coal Iron press and it didn't even come with a pressure gauge or fluid filter. Two things I consider important, and not that expensive to include, especially compared to the $3,000 price tag of the 9 ton press I ordered, and got an 8 ton.