*Be aware* this work can be quite tricky, you need time and patience, take your time and don't force the gauge on any ways. If your gauge is way too off, ask your dealer for a new one, maybe they can help you 
This tip was showed to me by Gijs (Weatherby on the forum), i'm only sharing it with you on a thread with explanatory pics.
Well, most of the pressure gauges tend to be some bars off as they aren't intend to be super accurate, just a refference point to know where to refill; in my case mine was 10bar off (lower).
Anyways, i like to have my gauge spot on instead of add 10bar in my mind every time i read the gauge so i decided to recalibrate it to the real pressure (compare with tank/handpump).
1. The first step is to remove the plastic cover on top of the gauge, this is for me the trickiest part in the whole thing, gently pull it towards you wile making movements to the sides. You will see two slots where the plactic cover clams in, search them and your goal is to remove it from those gaps. Don't use extreme force as you can bend the white dial plate inside of the gauge when you remove the cover (it's easly straightened)
2. Now that you have the black dial exposed, you have to pulled it out the gauge. In my case i used 2 small knives (the tips only) and pulled the dial from the buttom and thickest part towards you (it's very probable the dial jumps out of the gauge, so if you pull it towards you it's almost impossible to loose as it will hit you). You can use small pliers as well, maybe you find it easier to remove, but keep in mind on both ways the dial is pretty tight in the shaft, so a bit of force is requided. On the pics you can see the dial already removed from the shaft and the two knives i used (the tips only).
3. Check the pressure on your tank/handpump and push the dial back in the shaft in the exact same pressure, use patience. Reinstall the plastic cover pushing it on the same slots it was and that's it. Following pics shows the results.
I hope you got me , if you have any questions let me know.
This tip was showed to me by Gijs (Weatherby on the forum), i'm only sharing it with you on a thread with explanatory pics.
Well, most of the pressure gauges tend to be some bars off as they aren't intend to be super accurate, just a refference point to know where to refill; in my case mine was 10bar off (lower).
Anyways, i like to have my gauge spot on instead of add 10bar in my mind every time i read the gauge so i decided to recalibrate it to the real pressure (compare with tank/handpump).
1. The first step is to remove the plastic cover on top of the gauge, this is for me the trickiest part in the whole thing, gently pull it towards you wile making movements to the sides. You will see two slots where the plactic cover clams in, search them and your goal is to remove it from those gaps. Don't use extreme force as you can bend the white dial plate inside of the gauge when you remove the cover (it's easly straightened)
2. Now that you have the black dial exposed, you have to pulled it out the gauge. In my case i used 2 small knives (the tips only) and pulled the dial from the buttom and thickest part towards you (it's very probable the dial jumps out of the gauge, so if you pull it towards you it's almost impossible to loose as it will hit you). You can use small pliers as well, maybe you find it easier to remove, but keep in mind on both ways the dial is pretty tight in the shaft, so a bit of force is requided. On the pics you can see the dial already removed from the shaft and the two knives i used (the tips only).
3. Check the pressure on your tank/handpump and push the dial back in the shaft in the exact same pressure, use patience. Reinstall the plastic cover pushing it on the same slots it was and that's it. Following pics shows the results.
I hope you got me
, if you have any questions let me know.
