This sensor is 6mm in diameter, which is too large for some singles, which have a dipstick tube of 6mm internal diameter.
If your bike has an internal dipstick tube like this, then please consider the 4mm diameter sensor ACA60020.

Keep an eye on your oil temperature with these German manufactured high quality items. Replaces the filler plug, vibration damped with a range of 20-140°C.
This precision temperature gauge replaces the original oil filler plug.
To keep the needle steady the instrument is filled with a damping fluid.
Accurate reading.
The outer ring provides a solid grip and makes installation and removal easy.
Please note, this item is not intended as a dipstick; it is not marked with a fill level, and so is for measuring oil temperature only.