After installing my doubler i'm trying to rig up a speedo for the D300 the original t-case was a chev np233 and had an electrical speedo vs the cable off the 300 is it possible to mate the two together somehow? anybody make a kit? heres a goodness shot:D
http://i80.photobucket.com/albums/j200/redder22/2007_0401doublerin0029.jpg

AFAIK, any 97 - 03ish TJ speedo gear with the electrical sender will fit a D300 with the long tailhousing. I can't help you out with the connector splicing for your current wiring setup though....

^
the above is true for any NP231J that used a gear driven electronic sender. I also have no clue about grafting yours to a Jeep sendor.