Om60- 1/ 2 / 3 have a Port at the back of the Cylinderhead.
Size is M10 x 1
I use it for Oiltemperature at my Turbo-OM602
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93´ W124 300TDT -> OM606.962 / RS 203 Dieselmeken 7,5mm 210cc / KKK K14 / Stock Transmission / 2,65 ASD
89´ 190D 2.5 Turbo -> OM605.960 / Dieselmeken 7,5mm 180cc / Holset HX30 Super / 716. 654 6-Speed / 2,87 Rear Axle