1) When you connect the LED does it matter which lead you hook as power or ground? I just hooked it up and I can't remember which way I did it but i figured it did not matter.

2) What fuse can I tap for power to activate the relay? I already have my tach activated by the ten amp fuse. Can I use any of the other fuses to get power?

 

1) When you connect the LED does it matter which lead you hook as power or ground? I just hooked it up and I can't remember which way I did it but i figured it did not matter.

I think it does matter. I tried mine one way and it didn't work. The other way it did light up.

2) What fuse can I tap for power to activate the relay? I already have my tach activated by the ten amp fuse. Can I use any of the other fuses to get power?

I used the "Cruise/AC" fuse, but you can also use the "IGN" fuse under the hood in the box on the driver's side. The draw to power a relay is really small, so it's not a problem to add it on to an existing circuit.