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Hereīs how the pan looked like with two of the four suctions removed.




So I'm curious, do run a vacuum pump with your 3 stage? Would a vacuum pump be necessary with a 4 stage?



No I didnīt, and it didnīt make much vacuum either.

You would have to ask each company that makes dry-sump pumps to get the correct answer.
Thereīs atleast 3 types of gears that dry sump pumps use, I think Peterson now have a twisted roots loob style also, so that makes it four typer, maybe there are more.
Most 4-stage pumps will not make vacuum that can be compared to an extra moroso vacuum pump, but a roots style dry sump pump with wider scavenge sections will pull lots of vacuum.
Georotor( moroso) and regular gear type like my old Weaver pump, will not create 15" of vacuum.

Edit: with regular gears, I meant spur gears ( googled).