The ferrule's that came with my boost gauge where tapered to one end, more so than the other end(a directional ferrule). The picture in my instructions show the ferrule being equally tapered (non directional ferrule). So I did my best to figure out which way was the right way to install it. I also think I might have over tightened the sealing nuts. And to end off, I need to undo the connection on the back of the gauge so I can install my gauge properly(not sure if the ferrules are one time use, especially if I over tightened them).

So anyways, once I unhook and rehook up my boost gauge, I'd like to know if there are any leaks. Is there any easy way to do this?

Thanks

You could use a small amount of soapy water, just a few drops around the fitting. If it's leaking, it will likely start bubbling up.