For conversion, it's best to get complete system from other car:

- 4A-GE engine, complete with all accessories, distributor, injectors, etc.
- matching harness and ECU (same year and version as engine)
- instrument cluster
- fuel-pump and lines
- intake tracts and AFM or MAP sensor to match engine & ECU
- exhaust

That should be minimum, I may have left out some items. These older ECUs doesn't have immobilizer. Dash can stay same, you just need the instrument cluster since the 4AF most likely uses mechanical speedo cable and coil-trigger for tach, while the 4A-GE uses electronic VSS and ignitor IG- for speedo & tach.

 

The 4A-GE uses a C52 tranny which uses mechanical speedo. Correct me if I'm wrong on that but it is mechanical on my 4A-FE's C52.

 

Ah, good to know.

Another idea is to keep existing trans. Can keep same cluster then. Speedo would still work the same. Tach trigger may need to be moved to one if the wires on 4a-ge ignitor.

 

Correct on the speedo

 

you say you have an EE92..... you sure about that? If so, then you don't have an A series motor, but an E series (like the Tercel).... if it's a 4af/4afe then it's an AE92 (yes the EE90 does exist).

If you have an E series motor then things could be different in simplicity of swap.

If you have a 4a in there already, then you'll need, at minimum:

Engine
Figure out exhaust (4afe/4age do not line up)
Figure out power steering and alternator (located on opposite sides of engine)
Wiring/ECU (modify stock or find 4age counterparts)
Find appropriate flywheel (if you plan to keep the stock trans)
If you keep the stock trans and want to keep the intake side starter, you will need to build a new intake bracket

Among other pieces....