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thanks for promoting us rebel
good to know we r liked

u dont need a square wave into the ford ecu unless u run an auto box
just let it go into limp mode im sure it should no worry it
y doesnt yr elect speedo accept a sine wave
its prob a not popular brand eg not vdo which is what we normally use
most other brands cause too many headaches like this
i have sine to square wave boxes bit cheaper than what u got quoted
but if u then need signal to ford au ecu u might need a signal booster

whenever i wire up ford au v8 with an auto i fit my signal booster from gbox sensor to the engine ecu and this sends the correct signal to ecu so that it changes gears

as for manual gbox i would not bother bout spd to ecu

anyway i do have units to help get yr speedo to work