I'm am absolutly furious with Quadzilla right now. Two weeks ago i order a Rail pressure guage from them, hook everything up and realize that two wires are pulled from the monitor. I sent it back they tell me that they fixed my monitor instead of just sending me a new one. I finally get it back today, hook it up and the rail pressure reads 0 while the fuel pressure reads 44. i dont even have the fuel pressure hooked up!!!!!!!!!! Then i call quadzilla and of course they are closed for the holiday weekend. Am i doing something wrong here or are these guages junk. Sorry for the rant but if anybody know what is going on here please let me know.