2 good locations i can think of...
1- 1/8"npt port on top of the filter head. .
2- in the engine oil pan. . either punch & tap the pan, or find an adapter bushing and plug it where your oil drain plug goes. . i think the plug is m18x1. 5. . you could use a m18 plug and tap it for a 1/8"npt, or get an adapter from m18 to 3/8" npt and bush it down to your temp probe thread size [i can't find a m18 to 1/4" or 1/8" npt, only 3/8" and 1/2" npt... ]
for plug - 18MMOR-PLUG [gates hydraulics part number]
for adapter - 18MM-6FP [gates hydraulics part number m18 to 3/8"nptf]