This was not an original idea; I got it from GregB (link). Many thanks for doing the research
I don't think the Scangauge is in vogue anymore with the OBDC&C, but I had one sans the cable and finally got around to installing it. Works great so far and was free so no complaints.
That basically covers it.
Pros:
-Free, easy way to get any length Scangauge II cable in your car.
-I assume you'll be able to use the OBD port with another OBD scanner without having to disconnect the Scangauge II
Cons:
-Supposedly only works with Scangauge II
Cost:
-Probably free. A few bucks max.
Tips:
-Be sure to check your ethernet connector for pin style.
-Test your Scangauge by sticking the 3 wires into their respective slots via the connector side first.
-Don't yank on the OBD pins trying to get them out. Remember to undo each terminal lock (one on top, one on bottom) and then I found it easiest to use the end of a paperclip that I had flattened 1/4" with a hammer to pry the second locking tab from the connector-side. The wire should come out very easily.
-Thick heat shrink will not slip back into the connector easily. I had no problems with the thinner (probably less expensive) advertised as 3/32 heatshrink.
-Only uncrimp the one crimp. It's hard to uncrimp the other and they're somewhat delicate. Heatshrink alone may be adequate if you can't get it uncrimped or don't want to mess with it.
-Since it's a rather crappy crimp strip 1/4-1/2" of insulation off the ethernet cable to maximize your chance of a connection
-Zip tie the ethernet cable to the OBD cable ~3" from the connection for strength.
Risks:
-Eh, not much. worst that happens is you break a wire or OBD connector, and they're cheap & readily available used. By the time you spend the $5 you'll be a pro at depinning your old one
(I practiced on one I picked up at the junkyard and didn't break any pins/wires/connectors, even with a ton of excessive force)
**forgot to add that you'll need whatever length of ethernet cable you want to use (duh!)
I don't think the Scangauge is in vogue anymore with the OBDC&C, but I had one sans the cable and finally got around to installing it. Works great so far and was free so no complaints.

That basically covers it.
Pros:
-Free, easy way to get any length Scangauge II cable in your car.
-I assume you'll be able to use the OBD port with another OBD scanner without having to disconnect the Scangauge II
Cons:
-Supposedly only works with Scangauge II
Cost:
-Probably free. A few bucks max.
Tips:
-Be sure to check your ethernet connector for pin style.
-Test your Scangauge by sticking the 3 wires into their respective slots via the connector side first.
-Don't yank on the OBD pins trying to get them out. Remember to undo each terminal lock (one on top, one on bottom) and then I found it easiest to use the end of a paperclip that I had flattened 1/4" with a hammer to pry the second locking tab from the connector-side. The wire should come out very easily.
-Thick heat shrink will not slip back into the connector easily. I had no problems with the thinner (probably less expensive) advertised as 3/32 heatshrink.
-Only uncrimp the one crimp. It's hard to uncrimp the other and they're somewhat delicate. Heatshrink alone may be adequate if you can't get it uncrimped or don't want to mess with it.
-Since it's a rather crappy crimp strip 1/4-1/2" of insulation off the ethernet cable to maximize your chance of a connection
-Zip tie the ethernet cable to the OBD cable ~3" from the connection for strength.
Risks:
-Eh, not much. worst that happens is you break a wire or OBD connector, and they're cheap & readily available used. By the time you spend the $5 you'll be a pro at depinning your old one
**forgot to add that you'll need whatever length of ethernet cable you want to use (duh!)