RPM gauge is not working

[ain't care s13]

My s13 runs great but my gauge is not working can some one help me out ?

[bmxer882x]

let me guess, sr20det swap on a sohc? it wont work.
you need a dohc tach (just the gauge) or a jdm sr one

[AzS13hatch]

More info would be great but I'm going with the above post as well.

[angel mkiv]

If it was working before and just randomly stopped working then most times its your gauge cluster..that was what it was for me the past couple times in a s13.but obiously check your wiring and that your speedo sensor is connected