If You already consider having a GCU in your project, here are the must have things You need to include in your build in order for it to work properly.
At first your vehicle must be equipped in any ECU that can send signals to RPM, TPS or PPS sensors, or if your engine is boosted also MAP sensor. Most of transmissions will require complete rewiring of mechatronics and making external wiring connecting GCU with transmission which both we offer to make just right for You.