S13 guage cluster help needed please

[DanielPurcell]

Hey I've recently bourght a s13 Silvia with a rb20 conversion and for some reason the speedo doesn't work and the tacho guage has lots of lag when reving
Any help in why this could be ?
Thanks

[Butcher240sx]

Probably has the 4 cylinder gauges. You need a signal converter or use J30 cluster.