Hi All, sorry to revive this old thread but could anybody help me with a bit of advice. I'm hoping to do this neat little mod so I can monitor oil temp on my 2.3 Duratec CSR. I've got the indicator toggle and the wires sorted but the question is where is best to insert the new water temp sender in order to get a reliable oil temp reading. The attached pictures are the bottom of the bell housing and there is already a temp sender there inserted into a sump plug which I presume is monitoring oil temp for the ecu but I'm not sure?? The other side of the bellhousing looks the same apart from the sump plug on the other side doesn't have a temp sender in it so am I best off removing that sump plug to tap a thread into it and insert the new temp sender there to monitor oil temp or does anybody know if there's a better place. There doesn't seem to be anywhere available to put the new temp sensor on the oil pump. The sump plug nut is approx 31.5mm and it's thread diameter is approx 27mm. Does anybody know the exact thread size of these plugs and where they are available from as caterham don't seem to have any. Thanks