I'm trying one of these as a oil temp gage...
The cable is a little short as I've attached it to the forward facing oil port.
The 14mm size fits tightly on the plug.
Even on a cold morning it's reading 197°F and 209°F on the way home.
This mornings run got it up to 220°F mainly cause there was no traffic and I ran 75/85 all the way.
I was wondering if it got that high cause the oil was on the lower mark so I ran 70 back home and it was more or less normal 200°F
Once I lengthen the cable, I'll paint it black and stick it on the backside of the flyshield for an indiscreet gage. Got a 12mm ordered for the head too, but might have to grind a little relief to one side of the spot face for the sparkplug to give the ear for the cable a little room.