if i was to do it, i would wire up new wires directly from the HU to the side kickpanel under the dash. (driver side above fuse box, passenger side lower right of glove box) from there split the tweeter and woofer wires.
also check out what 90ST and Big recommends as they've actuallly done the install.
ill do mine when im ready to swap out the HU in a yr or so.
