There is no autoexec.cfg file in the Config Folder. We all have to make one manually, then copy and paste it into the Config Folder.
Here's how to do that.
1. Open Notepad
2. Copy and paste the color scheme you want for your meter. See this topic
3. Save the Notepad file this way. Where the field says File Type, choose All Files
4. On the top left of Notepad (File), click Save As.
5. Type in the file name autoexec.cfg then save the file
Here is the Click Path: C:\Program Files (x86)\Steam\steamapps\common\Perfect Golf\Config
Important Note: Make sure your swing choice in the game is set to Swing Meter for the new autoexec.cfg to work.
You should have a blank file, not a text file. After you have completed these steps, right click the new autoexec.cfg file, copy it then navigate to the Config Folder in Perfect Golf. Right click your mouse and choose Paste. Now you have the color scheme you want for your 3click meter.
When you have chosen your own colors or copied the codes that some of us have provided, and you like the color contrasts, save that file in a safe place so you do not need to create it again. See here