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Disclaimer: This is not all my information, but it seems to be working OK. I am posting because I had some difficulty figuring it all out.
2008 FEH, Scangauge II with Gauge, firmware 3.15 (received 10/4/07).
Use the instruction found here for entering the information. I used memory 0.
http://www.scangauge.com/support/vehiclespecific.shtml
Values to enter: (do not use=) TXD=0745224923, RXF=046285490623, RXD=3010
MTH=007D20000000, NAM=SOC. Don't forget to SAVE. The D in MTH is after the number 9 as it is a hexadecimal numbering system i.e. 0123456789ABCDEF.
I then went to Home and Gauge and replaced the VLT with SOC by repeatedly pushing the VLT button.
Seems to work fine. The readout is percentage of charge.
I have other untested values, but will wait to see if these are correct as I don't know what all the numbers mean.

i entered the commands for the hp gauge. works fine in the insight!

Disclaimer: This is not all my information, but it seems to be working OK. I am posting because I had some difficulty figuring it all out.
2008 FEH, Scangauge II with Gauge, firmware 3.15 (received 10/4/07).
Use the instruction found here for entering the information. I used memory 0.
http://www.scangauge.com/support/vehiclespecific.shtml
Values to enter: (do not use=) TXD=0745224923, RXF=046285490623, RXD=3010
MTH=007D20000000, NAM=SOC. Don't forget to SAVE. The D in MTH is after the number 9 as it is a hexadecimal numbering system i.e. 0123456789ABCDEF.
I then went to Home and Gauge and replaced the VLT with SOC by repeatedly pushing the VLT button.
Seems to work fine. The readout is percentage of charge.
I have other untested values, but will wait to see if these are correct as I don't know what all the numbers mean.

Glad to see that it works the same in an 08 FEH. I posted a short list on GH a week or so ago of xgauge coding for FEH PIDs. I thought that would be on the SG website by now, but I guess it takes some time. In case anyone was curious as to the MTH numbers, they are three two byte hex numbers that represent multiplication,division, and addition (or subraction, using 2's complement.) For the SOC, the scaling (see earlier post for hundreds of FEH PIDs) is .00152588, which is actually 100/65536. Since we want a reading to the tenths, we multiply by 10 to get 1000/65536, which simplifies to 125/8192, which in hex is 7D / 2000. There is no offset so the last bytes are 00 00. Putting an 8 in the 5th position of the RXF causes the SG to divide the result by 10. A 4 divides the result by 100, a 0 doesn't divide.

I cannot get the HV battery current to display properly because it is a scaled 2's complement. If anyone can figure out how to convert a scaled 2's complement using the SG simple math described above, please let me (us!) know!