Rev counter reading high!

[1905 adam 0]

Hi all,

After some advice. 1987 1.9L (ph1). Completely stock. Running well.

Rev counter has just started to read high intermittently. I’ll be driving around with it reading accurately, then for a few minutes it’ll read about 1000rpm higher than it should. Then it’ll settle back down to being accurate.

Any suggestions as to what to check?

Many thanks!

[Thijs_Rallye 89 4 Cars]

I'd check the PCB for cold joints.

[1905 adam 0]

2 hours ago, Thijs_Rallye said:

I'd check the PCB for cold joints.

Hi, thanks. Do you mean the ECU?

[SRDT 199]

Not the engine ECU, the PCB on the back of the rev counter.

Only a few 205 are taking engine speed from the ECU and those are not GTIs.

[Thijs_Rallye 89 4 Cars]

On 4/25/2025 at 7:12 PM, 1905 adam said:

Hi, thanks. Do you mean the ECU?

As SRDT says. PCB of the revcounter. The revcounter is pretty easy to disassemble from the cluster.

[1905 adam 0]

Ok thanks.