How do I tell if my ECU is for a 5 speed or automatic?

This will work for USDM OBD-1 ECU’s:

Read the code on it. The 2nd to last # on an automatic ECU will have a 5.
If it is anything but a five then it is a manual ECU.

For JDM OBD-1 ECU’s:

Reade the code on it. If the last 3 digits are 900 or 901 it is an automatic ECU.

Information Source:

Posted by Hans Desjarlais

After accidentally locking himself in a scrapped '85 Renault for several hours at the age of 5 years old, Hans developed a love/hate relationship with cars which eventually became an obsession. Right out of high school Hans started his first business importing and selling Japanese engines. After selling the business in 2008, he launched Import Insider to obsessively cover the auto industry and offer advice and tips to import car enthusiasts.

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