A quick tachometer hack I did. It simply changes the values on it, so it's more realistic.
Technical Stuff: It's a DXT1 texture, so it's not as high quality as it should be. I wanted to make it DXT5, but for some reason the nVidia DXT file format plug-in for Photoshop made it black and white if I did that. But it's not less quality than the original tachometer, so it's no loss or anything.
1. Open up your Rigs of Rods folder (typically C:Program FilesRigs of Rods 0.33d) for your version.
2. Go to your "data" folder
3. Find the current speedo.png and BACK IT UP by renaming it (like speedo_old.png)
4. Rename this file to speedo.png and add it to the data folder