96 GT with Tremec 3650. Speedo problem

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I have a 96 Mustang GT with a Tremec 3650 in it the problem im am having is. the 3650 has a magnetic speed sensor while the car originally had a T-45 in it with a Mechanical Speed sensor. So as a result my cars speedometer is like 100mph off. I will be doing like 20mph it will say im doing like 115-130mph. How do I fix this problem?


( I did not do the Transmission swap I bought it with the 3650 in it)

 

[96GTstang46]

Iam sure someone will correct me, but i think that DallasMustang.com has a piggy back speedo calibrator for $100.
Iam lookin at getting one cuz i have 4.10s and my speedo is also really far off. Just not by 100 lol...

 

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sweet thanks I will look into that!

 

[four six]

Yup Dallas speed cal works. I have that set up now. You'll need to to hook it up and then drive for ten miles and call someone at DM and they'll give ya the sequence for the switches.

 

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sweet thanks yeah I ordered it as soon as i saw it.

 

[johndeeregreen]

dallasmustang

Hey I have one from dallas mustang and I will say that there is only two companys that make that interface and well it is the best thing in the world I to have a 96 gt with a 3650 and it took me forever to find that part that and its worth the money you can set it for any gear ratio or any tranny it is a great thing I will say that.....