If you read the owners manual - your eight year old son is OK to ride in the front seat. According to the owner's manual you need to set the passenger seat as far back as it will go. But it is in the owner's manual that you can put any child, except a rear facing child seat in the front seat.
The airbag cutoff switch is a bear to do if you do it legally, requiring you jump through a lot of hoops, and spend a lot of money... ($350 to $500 depending on the part of the country and parts used)