The D112 was designed for upright bass, it just happens to work on kick drums. You can use it for guitar, I've tried it and didn't like it. You have to remember that a heavy guitar sounds power is an octave or two above the fundamental frequency of the note being played. Even when the guitars are tuned way down, that puts the heavyness in the 100hz to 200hz range. The heaviness of a kick is in the 50hz to 100hz range.
The D112 is great on bass, I don't like it much on guitar. It doesn't pick up a lot of what makes guitars sound good.