Rev counter problem

Hello all my name is: Del
I have a: (GTO, TT)
It has the following issue: (Rev counter not working, I have had a new ptu fitted as people say that that would be the main problem, I removed it and re fit in case the connection were not mating up but still not working, wondering what to do next? advice appreciated )

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Capacitors at the back of the tachometer perhaps? Fixed my Tacho thanks to Joe

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The caps are old, yes. But also other factors effect their life. Check your charging system. Voltage spikes can / will cause component failure. Having repaired many electronic units using capacitors, I have found you need to look past the components themselves and look at resistors, transistors and even bad connections. High resistance causes voltage spikes.