I have installed about 6 or 7 EZ wire kits, and, for the price, you can't beat them.
I only had one minor problem with them, which is, to hook up an MSD box where you need constant power with key on, both start and run, I found that the only circuit having both was the radio circuit.
Their instructions are a lttle vague, but not as bad as with some other things I have bought.
Paul
