Stock cluster with speeduino

Hey guys . So i recently finished fitting a speeduino ecu to my micra (non-coilpack) and i cant get my stock rev counter to work . The speeduino board outputs an rpm signal but it seems that the cluster doesnt work with it . My question is , what type of signal does the tacho need to work ?Any suggestions ?
I couldn't get an aftermarket tacho to work with the micra's tacho signal wire, I ended up using the return from the coil. So I think the micras tacho signal differs from what's expected.
Panos Ex
Yeah i know , Chie's post helped alot , im gonna assemble the circuit and keep you updated . The guy i bought the parts from said he did the same thing to install an aftermarket tacho on a 100nx with distributor , same wiring with the micra .