Is kyle tack as sharp as a tack?

The idiom itself doesn't exist. You can use "skarp som en kniv" or "skarp som en rakkniv" which means sharp as a knife and sharp as a razor, respectively. Since it is a similie it will be understood...

hi im awesomestic,or u can call me horsegirl # 1!to answer your ? for western the bridle u take the latch and hook it as tight as u can almost as tight.for the saddle u take the strap or rope and...

Tack is the leather gear used on a horse for riding.

You could use a magnet, which would attract the iron tacks but not the brass tacks.

No, it is better used to mean perceptive, or sometimes cunning.