PLEASE HELP

The first question i hope is straight forward i have a 2001 a4 avant quattro sport 180 engine no AKE

im told by audi there are 2 temp senders, 1 for the ecu (green with 4 wires on) which i have changed and 1 for the temp guage(poss black 2 wires on) where is the location of the 2 wire sender and how to access it would be appreciated. reason is temp guage is reading low and occasionaly stops working so need to change sender first

my other question is how the dickens do you remove the boot door linings to access rear of number plate lights- ive tried removing the 2 bolts behind the warning triangle and the two in the grab handles but it is still fixed somehow- anyone know how it is done?