Been working on my new to me 07 f800s and sorting things out. Bike has been sitting since 2011, 2012. Fuel was bad as well as the pump. Cleaned out the tank and changed pump and the bike runs great. The triangle light is on and when I hit the button I get -- --. My guess the light is on because it's not reading the tire pressure. So the batteries are dead, was wondering if there is a way to wake them up, aftermarket replacements or new batteries? Thanks for any input.