fuel gauge and temp gauge needs fixing

what do i need to do? fuel gauge always goes straight up to full when i turn bike on and temp gauge dont do nothing.

dont have a clue were to start?
with the temp gauge you recon it will be the sender on the top of the cylinder head, just loose or sumit?

need to get the fuel one sorted really cus its doin my head in trying to figure how much petrol i got left lmao

 

runner fuel guages always go right to the top. then come down in the last 20miles you sure it just doesnt have a full tank

yes the wire on the sender is normally the problem it breaks or falls off