[Scruggs]

Have a 1994 Mustang that was an automatic and has been retrofitted to a manual. Now the speedometer does not work , computer vss signal reads 120mph at idle. I understand there are differences in the speedometer head and some connectors, and the manual uses a pulse generating sensor where the automatic uses a cable and 2 electronic sensors. Is there a fix for the no speedometer issue without going through major parts exchanging?

 

[wmburns]

The post does not state what's the MY of the donor transmission. IF the donor is a 99+, then an extended range SpeedCal can convert an OSS signal to VSS.

Recommend that you do your homework before purchasing anything.

 

[SPeace-ATL]

X2

It does sound like you have a T5 with a 99+ OSS type speedometer sender and you need a 94-98 type with the VSS sender.

You can look at the sender to see if you have a VSS or an OSS.
The older VSS sticks straight out and the newer OSS plugs in at a right angle. The plug will actually fit either one, but the signals are quite different.

...and yes, the easiest and most cost effective fix would be to get the Extended Range Dallas Speed-Cal to convert the signal.

 

[wmburns]

1994-2010 Mustang Speedometer Adjuster/Calibrator, M-4209Adpt-A

Here's a link to another product that looks like it should work as well.

1994-2010 Mustang Ford Racing Speed-Dial Speedometer Adjuster/Calibrator, M-4209Adpt-A at LRS - Same Day Shipping!

The instructions are very detailed (good thing IMO).

http://media.latemodelrestoration.com/downloads/instructions/M-4209ADPT-A.pdf

Read the parts about the limits on late model automatic transmission (10%).