The pump will help ensure all taps are at max. possible vacuum, but it will require a releaser. If you will have 30+ feet of drop from the lowest taps to the tank or the main you won't need the pump. If a good portion of your taps won't have the 30' of drop below the tap a pump will help. Remember, natural vacuum never breaks down and it runs for free, but if every tap is not getting the highest possible vacuum a pump will bring it up considerably.
I use a hybrid system on my bushes, much is on 3/16 with good drop but the vacuum pump increases the sap from any taps that are too low to get full advantage of gravity vacuum.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.