ahh, i had my radar tapped into the radio fuse so it only worked with the ignition. I just twisted the wire around the fuse and plugged it back in. To find which side of the fuse is hot, you just need a flat head screw driver and put it into one of the slots that the fuse goes into, then put the wire on the screw driver.
For grounds, ah, on my 94, i ripped off the plastic cover piece next to the ebrake pedal and found a good ground there.
hope that helps