N-channel MOSFET with Vgs(th) 10-12V?
Just use a resistor potential divider circuit or even one with a zener in series with the gate. The zener voltage will have to be exceeded before any significant voltage is attained on the gate. If using a zener it's best to assume low impedances to drive the gate. For instance a 10V zener and a FET with 1V threshold would likely need something like 10k across the gate to ensure zener leakage currents don't create a "false" gate voltage due to high impedances.