The ecu still receives an input, otherwise how does it set the 112mph limit.
If there is defo no sensor in the gearbox then maybe it is derived at the back of the speedo binnacle from the cable.
I seem to recall looking at an old binnacle out at tones many years ago which had some sort of electrikary on the back.
If you get the ecu pinout off jgm's site this will tell you what the input pins are for the speed sensor and the expected voltages.
Is the car in limp mode and is it fitted with a converter/delimiter as these have been known to fail and cause limp mode.
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