Tis is the sensor
http://adaptronic.com.au/products.html?page=shop.product_details&flypage=flypage_new.tpl&product_id=52&category_id=5
M14x1.5
By this chart,
http://www.coasteltools.com/tech_tap_drill_mf.htm
im guessing i need a 12.5mm Tapwhere as the one i was sold is a 11.8?
One is was sold http://www.bordo.com.au/_productDetail.php?productId=4906
Should have looked the info up before i went to the shop, but the shop visit was an unscheduled, look a tool shop lets go in type of visit.
If this info is correct i have plenty of room to drill out alittle further
Can some one who knows this stuff confirm if i am correct?