turbine.lua

rpmTarget = 1800

t = peripheral.wrap("bottom")

while true do
  speed = t.getRotorSpeed()

  if speed > rpmTarget then
    t.setFluidFlowRateMax(t.getFluidFlowRateMax() - 1)
  elseif speed < rpmTarget then
    t.setFluidFlowRateMax(t.getFluidFlowRateMax() + 1)
  end
  sleep(.1)
end