Hello Wayan,
to connect your oil-temperature-switch the best way to go is, you go to Kwaki and buy the no. 92002-1427 BOLT, OIL SWITCH like it is used for the oil-pressure-switch. Remove the bolt from the tube-assy (crankcase-head) at the right side, what is the other end of the oil-tube coming from the oil-pressure-switch. There you plug in the bolt from Kwaki and in this bolt you put in the oil-temperature-sensor from Koso (don't forget to use teflon-tape). So you messure the oil-temperature in the main-line and you read the correct value.
I hope you can understand what I'm talking about and if not refer to page 13 of the parts-catalog and also excuse my bad english.
Good luck.