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I have an Actron code scanner for EECIV. It works on my 1987 Ford Tempo, but it doesn't fit into the interface of the 1989 Ford F250. They both use EECIV but the interface is different.
I read that Ford truck of that year can use STAR tester. So which model exactly should I get for the '89 year?
All EEC-IV test connectors are the same. You should be able to use the same tester on both vehicles. You don't even need a code scanner if you don't mind counting the number of times the check engine light blinks. There are instructions for pulling the codes on http://fordfuelinjection.com if you want to find out how to do it without the scanner.