If your check engine light comes on you should get the codes read. On the 96+ cars you need a special code reader. This will tell you what sensor the computer thinks is in error.
I still recommend testing the TPS, it's so easy to test, and could save you from having to pay for the code reader or having someone do it for you (unless you have a buddy with the code reader).
Let me know what your TPS voltage is or what code comes up.
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1995 Mustang GT