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hey dimi

on the ford ecus there is no external wiring thats goes to the tacho alone

its done by serial data

you can try an adapter that runs off the crank or cam sensors

u just have to be careful u dont disrupt one of these signals or engine might start missing at hi revs or something similar

another thing ive heard can be done is remove ecu covers and on the circuit board there is a pin or track that has rpm signal but this might be risky
ive heard it being done never seen it

easiest way is to hook up tacho booster from cam signal but first i would have to see how many triggers are on each
as i think the crank signal is way to many pulses and its prbably not perfect as it has a missing tooth pulse

so cam sensor might be the go

or run a 4 into 1 tacho booster off 4 coils then it has 1 output