I used this in the nova with the old SBC, now with the lsx I am not needing it. It really was never used but it was wired up, paid 70 bucks from jegs, sell for 40.00 very nice product, instructions to wire it up are on jegs website and also all the wires are marked from painless.
I used the relay to run my cooling fan and still have 7 circuits for gauges, linelocks, transbrake...or whatever you find the need to run fused power to on your project
http://www.jegs.com/i/Painless+Performance+Products/764/70107/10002/-1