Its still the blue wire, it just changes colours a couple of times on it way to and from the ecu.
Also its where i patched in to take the rpms for my emanage blue...i think the wire ive mentioned is on its way to the ecu and then theres another leaving the ecu for the original dash cluster. But i'd advise checking a wiring diagram if you want to make 100% certain (patching into the signal going to or from the ecu i doubt makes little difference though).
Actually worth noting mine is a 95...so cant say how the dizzyless ones are wired to tacho (as of now never looked), but might be the same kinda deal.