here is a wireing diagram

This is the closest I have found:

https://hiace-super-custom.forumotion.com/t3421-capacitors-also-cause-tacho-and-speedo-failures

This is for the 1KZ-TE engine however, ECU's will probably be quite different for each engine type.
Your best bet is to identify the code which your particular engine is known by (e.g. 1kz-te for the 3 litre one) and find out what other Toyota models use it and target the most popular model.

Note there may be small differences in the ECUs as they may be tweaked for application and auto/manual may have differences.

Hi guys, are there any live links for the wiring diagram? None seem to be working at the moment.

Hello guys, do you have someone AC wiring diagram?  

Any wiring diagrams very appreciated.

Thank you

Hi all, wondering if anyone has a wiring diagram for 90s  series supercustoms floating around still? Have a 96 model that wont start. Thanks