those radar detectors use so little power you can just wrap the wire
around the fuse terminal and push it into the fuse box.
i used a generic 2 conductor phone line to wireup my 7500.
and just tucked the cord under the a-pillar cover and up the
ceiling. no need to remove any of the panels.
for ground you can find a bolt or i used a panel clip (looks like a
binder clip without the handles) and sandwich a bare wire between
the clip and steering wheel column metal. that's how little power
it takes. should only take like 10min to do this hardwire.