[Gauge cluster problems]

I pulled the cluster out contacts look relatively good the circuit on the back seems a little bunched up in places but nothing crazy turns out the speedometer works just not the tach do you know where that signal comes from ?

[Gauge cluster problems]

Gauge cluster problems

Hello everyone I'm new to the skyline community, just got my r32 gtst last week been having some problems and with limited time and resources could use a helping hand.

So my problem. Right now is all my gauges do not work except for boost gauge and oil pressure but I suspect the oil pressure gauge is also broken. When the car starts the oil pressure starts off low then drops to zero after a couple minutes as there is no awful noise coming from the engine I assume the gauge isn't functioning properly the fuses and such are  labeled in Japanese for the most part so I'm having trouble with that and locating various sensors thank you in advance for the advice.