I Worked on this with some other guys on delcohacking thought id post it up here seeing your right into all the cluster stuff. We got it working all good.
Here's how to work it.
KM YOU WANT
1337km
ADD CHECKSUMS
00FF 13EC 37C8
FIND LINE CHECKSUM
00+13+37=4A ^ FF = B5
B54A 00FF 13EC 37C8
CONVERT USING NIBBLES FROM BINARY
B54A = DA25
00FF = 00FF
13EC = 8C73
37C8 = CE31
CONVERT FROM MSB TO LSB
DA25 = 52AD
00FF = FF00
8C73 = 37C8
CE31 = 13EC
BINARY TABLE CODED INTO NIBBLES LOOKUP FOR SECOND LAST TABLE CONVERTION
0=0,1=8,2=4,3=c,4=2,5=a,6=6,7=e,8=1,9=9,a=5,b=d,c=3,d=b,e=7,f=f