I didn't have an in-lbs wrench so I figured I'd do it by hand and guess. I tightened my cam chain tensioner just a tiny bit, because 40 in-lbs has to be just barely snug right? Turns out I was WAAAAAAAY off and 40 in-lbs requires a lot more force than I guessed. Alas, I am not an experienced technician
Autozone has in-lbs torque wrench on their loaner program. Pay a $50 deposit and get $50 back when you return it. Otherwise check harbor freight and make sure to get a free item with your purchase!