Speedo In Mph?

[N13Astra]

I bought a new instrument cluster as my old one packed itself but ive been having a problem.

The speed displayed is wrong. When i drive, it doesnt start moving until i would assume im going about 20kph. What i found which could just be a conicidence is that the displayed speed seems to be in MPH. I put my old tacho in and the speed works fine (60kph = 2900rpm in 3rd). I then put the new one in and at 2900rpm in 3rd it reports ~36 KPH.

How can i fix this problem if it can be fixed or is the tacho stuffed?

[jeffworld2]

there are a few things it could be.

1. wrong pin height for speedo needle: this will cause wrong speed to be dispayed but generally work fine

2. speedo has been wound back on the new cluster, which can make them do funny nonsensical things

3. the new cluster has been modded for use with a 300/320km/h display. as shown in the group buy thread, a small mod to the circuit board gives a very different reading, but the speedo will still retain smooth movement if this is the case.

[N13Astra]

this one has happened.

2. speedo has been wound back on the new cluster, which can make them do funny nonsensical things

Was done to set it back to the same kms displayed on my old cluster. How can i fix this?