This sending unit can be used on the 89 as well. It is just a different style than the 1989 version. If you did want to keep it correct, we have the 79-89 version available as well here
Answered by Scott G. from hewitt | Comment 1 0
From the factory, the oil pressure sending unit extension was only used with the 89-prior sending unit. While you can use it with this sending unit, it is not required.
Answered by Jonathan M. from Hewitt | Comment 0 0
Ford Mustang - 1990 (90) - 1991 (91) - 1992 (92) - 1993 (93)