Oil pressure switch

[StPeter]

An alternative to the expensive OE switch:
http://www.hewisclassicspares.co.uk/oil-pressure-switch-rover-600-800-sterling-triumph-acclaim/

You'll need a couple of M10 washers to lift the body clear of the oil pump.
I used these: http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=261073143690

I also retained the hex screw on the wiring connector 'cos it's easier to tighten.