Installed the SpeedCal in my '01 GT with 3650. It works fine.
It did take a little while to get the pins out of the connector.
Are you sure that you are working with the speedometer connector?

 

The SpeedCal works on all current model Mustangs. What specifically is the problem. The SpeedCal is furnished with the 4 pin connectors but 2 of them are plugged so the used contacts are still 2 pins. You remove the car harness backshell and put that on the SpeedCal. The take the supplied connector shell and put that on the car harness. Drop me a line if its still not clear.

 

what gears are you running,
i installed the dmp speedcal and have a 3550 in my 99 cobra...........was wondering why you are installing a speedcal.

 

TriBlkCobra - It is possible I was looking at the wrong connector, I am going to look at it again tonight. I'll message you if I have any problems.

360 Notch for ur LS1 - I am putting 4:30:1's in my 01 Cobra with the 3650 tranny. Aside from a chip, I don't know of any other way to correct the speedo issue. In addition I like the idea of being able to change the calibration without a re-burn.

Thanks,
Eric

 

Silver_Stang, that is about all I can think of. The connector is on the drivers side and I think just above the crossmember. It is a two pin connector with socket contacts in the car harness. Drop me a line if you need more help.