take the gas tank down and change the fuel sensor that is in the tank.
Any fender from a 1981-88 Monte Carlo should work
yes
wiring
Check the fuses.
bad switch or contacts
Not enough information to answer
Yes... Sort of anyway. The Monte Carlo uses a 4 door Chevelle frame even though the Monte Carlo is a 2 door car. The 4 door frame is longer than the 2 door Chevelle frame. and the wheelbase is 4 inches longer. So if you have a Monte Carlo, a 4 door Chevelle frame will work. If you have a 4 door Chevelle, a Monte Carlo frame will work. If you have a 2 door Chevelle, then you will need to use a frame from ANY 2 door GM A body except for the Monte Carlo.... The Tempest/Lemans/GTO, Cutlass, Skylark, and Chevelle all used the same frames and are completely interchangeable.
If the speedo in an 04 Monte Carlo doesnot work it is the stepper motor in the cluster. Go to eBay 04 Monte Carlo cluster stepper motors scroll down and by a set of motors .INSTRUTIONS COME WITH THEM TO REPLACE THEM vERY SIMPLE TO DO SO.
check the fuse.
Check the fuse. Check the wiring. Give more information.
There are 2 separate flashers.jd
instrument cluster is shorted out or corroded