This guide consists of six pages of instructions.
The pages should be viewed in sequence.
The instructions will explain how to access all the features of the 1990 & 1991 Reatta Diagnostic System. They will also explain how you can check current sensor data and how to use overrides to operate components like the EGR valve, etc. for testing purposes.
Thanks to 2seater, member of the Reatta forums, for this information.