This is what I bought on advice from Matfew and it is a good bit of kit.. I was advised to stay away from cheaper gauges for many reasons one being how far off they can be correct.
Road runner also are a great mob to deal with and even rang me to discuss a little problem I had (nothing to do with the product only my little brain).
At JPC they said my gauge was very close to accurate showing only a touch to the hotter side than actually was.
http://www.ebay.com.au/itm/EGT-Exhau...item462c44a79c