Doubt it will fit/work with your car. People put the digital dash in from an ae86, not a celica/supra. You're better off getting the fuel sender(hardest part to get) off him and then finding an ae86 digital cluster.
There are wiring diagrams/guides on the internet, or find one with a complete dash loom. It will work with a 4ac regardless (only have a problem when you start using a multi coil setup, although it aint that hard to fix).