FYI....I have an extra 30 mm and 32mm adaptor that installes in the upper radiator hose for an external temp gauge. Paid $20 each....make me an offer via pm and I can ship them out to you.
Just wanted to follow up with what I ended up doing since another memeber asked.
[ame="http://www.amazon.com/Sunpro-CP8208-Triple-Gauge-Kit/dp/B00029K01I"]Sunpro 2 " Gauges[/ame] and various sunpro adaptors also available on amazon : [ame=http://sunpro.com/product_category.php?id=269]Sunproョ[/ame]
The upper radiator hose had to be cut and I used a radiator adaptor (mine was 30MM) off of ebay. I did have to redrill and tap the hole that accepts the temp probe.