Stuck Tach?

[BlackbirdOfPrey]

I have a question, when I accelerate at WOT, the Oem tach rises normal speed, but once it gets to about 4k it goes up very slowly and sometimes not at all, is this normal, or does this indicate a problem?

 

[BlackAWD]

I'm no expert but I think if you can here the car's idol increase when you accelerate and the tach doesn't move then it wouldn't really be normal and would be time to replace it.

 

[Chuck_3]

my friend bought a cougar that had indiglo gauges but when the guy installed it he used tape or something but messed them up and it would go to like 3500-4000 and get stuck then go slowly to 5 when it sounded like 9 and we told are friend i think ur tachs messed up hes like nah man im only at 5!!! i can keep goin to my redline

 

[BlackbirdOfPrey]

How much time should it take to rip the gauges out, and check the tach for stickiness? I am sorta busy and time might be an issue. and if its broke, do I have to order a whole new gauge cluster? or can i get the tach seperate?