i believe you need a 2000 PPM signal for VSS input on the 747. You can get an inline unit that hooks up to your speedometer cable. This is probably the easiest. OEM got this signal a few different ways over the years, optical sensor on the back of speedo with a "VSS buffer" (usually a small green plastic box), and in later years a 40 tooth reluctor wheel that would be fed into a DRAC/VSSB. Both systems can take the signal and make 2000 PPM (ecu), 4000 ppm (cruise control), etc. you should not have to worry about these though.
EDIT: i am in the lower mainland btw, have a chip burner and emulator.
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