I swapped the 241OR in my XJ a couple weeks ago with Seiler's help. My speedo was reading about 15% fast like Seiler's. So, I ordered the dakota digital speed calibration box this week since it is the cheapest option, and installed it yesterday. Someone linked the SGI-5 dakota digital unit earlier in this thread, but here it is again.
http://www.dakotadigital.com/index....tegory_id=287/home_id=59/mode=prod/prd126.htm
They're in SD, so it only took 2 days to get mine since I'm in CO. I did talk to one of their techs to make sure it would work, and he told me there shouldn't be any problems. So away we go. Installation is straight forward. Much like the Superlift TruSpeed.
- Splice into the speed sensor signal.
- From the tc to the interface input (didn't need to connect the speed
sensor gnd).
- From the interface output #1 to the ECU.
- Connect to a good ground.
- Find a switched 12V source in your fuse panel. I used #17 per the Superlift instructions using a single auxilary fuse holder from autozone.
My dipswitch settings are:
DS#1 - ON
DS#2 - OFF
DS#3 - ON
DS#4 - OFF
I calibrated mine while driving using a gps, so I didn't do the calculations (even though they are easy). A quick drive down the road, hitting the down buttons a few times, and I'm spot on again.