Best way to torque crank bolt

Just to be clear, the OP asked about installing the crank BOLT, not the balancer. I mean, really now......if you have one eye and half sense, you won't over torque a crank bolt with an impact. Just install the balancer with the proper tool, start the bolt by hand and run it down until the impact gives about five or six smacks. That's tight enough. I always put locktight on every one I do. I don't care if it "needs" it or not. It's just good insurance. Course, every impact is different. Some of them Ingersol Rands are bad pups. If you're not used to what your impact feels like, use a torque wrench. But since I've been usin the same old red Mac Tools impact over twenty years, I'm pretty familiar with it.