Thread: Oil Pressure Sender Unit Size ?

I'm not sure why this is so difficult but can anyone tell me what size the thread is on a 96 V8 3.9 Discovery for the oil pressure switch.

I want to replace it with a gauge and put in a Oil pressure and Oil temp gauge but I'm having trouble finding out exactly what size the sender unit needs to be.

I want to keep the existing oil warning light in the dash and run an electrical gauge, so some kind of T piece will be needed.

I've phoned up the VDO and Speco "experts" but they don't know anything about landrovers...

if there is anyone else looking for the answer in the future then I found these threads

http://www.myrovers.com/?p=358

and even a write up

http://www.myrovers.com/?p=359