In my old 89 firebird l had a 120mph speedo. My 87 T/A has an 85MPH speedo. Will a 120MPH cluster bolt in place of an 85MPH cluster, and provide the correct speed information?

FWIW, the 87 does have the electric VSS and not a cable.

Thanks

 

So, l will be the first to try. ls that correct?

 

Guapo,

The electric (pulse-reader) speedo heads only count and register the number of pulses from the VSS. A 120 MPH head can just display more of them. As long as the speedo from the '89 is a pulse reader, it should work fine. Of course, the connections and mountings need to be the same. If the connectors are different, you may have a chore ahead of you.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
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Thanks.