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Presumably you are fitting the trans to your Silver-Grey Alcyone?
IIRC your speedo is calibrated to 180 MPH rather than it's original JDM calibration of 180 km/h.
This means that somebody has fitted a pulse converter chip between the speed sensor and the speedo. I would suggest trying to find this chip and removing it temporarily as it may be causing the problem.
You said that you definitely have a pulse coming out of the transmission. Presumably you managed to verify this with a multimeter or scope. Try testing the wire at the back of the speedo in the same way to see if the pulse gets that far or disappears somewhere in between.
Phil.
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