To start with, the first two characters will always be JG. After that, it (the 3rd & 4th characters) will be one of the following namely, 65, 66, 67 or 70. After that, the 5th character will be either M, N, P, R, S, T or U. For the 6th character - see this
page
For the SIDO, you will need to decipher this one on your own. Lastly, the character at the end will either be a C = 6 cylinder car of K = 8 cylinder car.
All details re VIN's can be found
here
Hope it works out for you.