Tach location

I got mine from Harden's Muscle Car World and it was a round $50. I have installed 4 of them so far. Mine and 3 for friends. Yes it glues onto the exsisting dash. Make sure you paint or dye the cap to the color you want before you put it on. First thing you need to do is test fit the cap and trim anything on the exsisting pad or cap to make it it fit tightly and correctly. To prepare your exsisting dash you take a razor knife and cut off all the raised edges around your cracks and clean it with rubbing alcohol or something to remove all the grease and oils. Then you take some scotch brite pad and rough up the inside surface of the dash cap. Take the glue and put a bead around the edge (about 1/2" in) on the dash cap and put it on. You might need some clamps and tape or something to wedge around it to hold it on tight.