Zenki tach drops at 3k

[Galaxy _S14]

Its been a problem since I bought the car but my tach will not read past 3k it just drops until I shift and goes up to 3k and drops like normal?

(Went from a integra to a s14... 8 years of my life wasted)

[Mikester]

^^Well, if it runs fine and only seems to be an indication issue, then I wonder if it's as simple as the cluster being the culprit.

[Galaxy _S14]

Tried a known working cluster checked signal wiring still won't past 3k

(Went from a integra to a s14... 8 years of my life wasted)