I go right into the radio harness or directly into the fuse box. Sender is obvious. Hot to hot, ground to ground or the frame and then the light/dimmer to the dimmer feed on your radio. It helps IMMENSELY if you have an aftermarket radio installed since the harness for those is pretty self explanatory.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.