Yes 12v, it's also a 13mm pump. I had the pump set at 550cc's and smallish delivery valves to just get some baseline runs. Ran a 10.16 set that way. I started off with the 1.10 housing to keep the drive pressure down as much as I could. If your running a 12mm pump I think you'll be fine running the .90 with no gate, unless you had plans to spray it then you'd prob need to gate. Run it and see how it does.
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