A quick search of the Internet didn't turn up the torque specs for these sensors. If the spec is for ft-lbs then you may be able to borrow a torque wrench from your local auto parts store. I've done that with my local Advance Auto Parts, but you may need to reserve it if it's a weekend job. If it's in-lbs then you may have to guess like I did when installing my front brakes. Not ideal, and you have to be careful not to over-torque. Of course, that's why you use a torque wrench...