Honda Monkey 125 Oil Temperature
Simply replace the oil filler cap with this gauge and you have instant access to the operating temperature of your engine’s oil.
The gauge is knurled for easy installation/removal  with no tools and is liquid filled to reduce vibration and thermal fluctuations.  
Thermometer panel can rotate 360 degrees.
After mounting surface can still rotate independently to the proper reading position.

Fit: 
Honda Monkey 125 18+

Glycerin thermometer after use a small amount of volatile is normal and does not affect functionality, please feel at ease.