Hey Chris,
I've done a few of these over the years and this should get you going
first you may have to go into the lowrance menus
and make sure com port 1's baud shoud be set to 4800
then you will want to hook the yellow from the VHF to the green of the Elite
then connect the shielding wire from the VHF to the shielding of the Elite
its basically only one wire you will use, then connect the shields together
only elite can "talk" and the VHF must "listen"
hope this helps Tim
Edit info added
try this on the lowrance
press menu twice, scroll down to and select nmea0183, check all boxes under the gps section, set baud to 4800 if its not already
GPS Verification
If the GPS receiver is correctly connected and it transmits valid data, the display shows GPS
Data OK. Press ENT-1W25W to open the GPS status screen and see detailed GPS data: