I'm about to change my spark plugs for the first time. My haynes manual specifies a certain number that I have to set my torque wrench to (15nm IIRC). Do I really need a torque wrench to do this or would just making sure that they are tight but not overtight do the trick ?
Torque wrenches are really expensive and I don't really want to spend that kind of money on something I'd hardly use.