about knock sensor on golf gti 2l 8v 1992?

i have recently had problems with my golf and need to replace knock sensor,i have just today took it out not knowing that it needs a torque setting for the nut, can any one help im desperate,n also if this sensor is broke would it cut the car out n make it splutter its for the golf gti 2l 8v 1992 k-reg.would be a great help thanks