Stereo & Electronics - What Is Draining My Battery??

I just installed an electric fuel pressure gauge and a boost gauge, my battery is draing I have to keep charging it. I taped into switched fuses in the fuse panel (The gauge lights and I think the radio) I grounded the sending unit by grounding the fuel rail. I checked the wires with test light to make sure nothing is hot when the key is off, and there is nothing hot when the key is off.. Please help thanks

have you checked anything with a multimeter? check current draw with vehicle off, if high - start pulling fuses until you notice a drop to normal levels, then proceed to break down that circuit further..

start with anything you have ever touched, or even looked at