Speedometer is loose, erratically waves back and forth on high speed or bumpy roads
Odometer not functioning. Neither is trip odometer
Heater block not working properly, I have to shut the heat on or off with a clamp to some air tubes in the glove box.

if I think/find more general interior/electricish problems I will post them here

Please help if possible with trouble shooting tips and how to guides. Complete car noob here.