radiator temp guage thread size/pitch?

[Jo Rhett]

So I'm planning to order the Vapor, but I've been unable to confirm  
the radiator thread size.  I guess I'm going to have to drain enough  
water to unscrew the stock one and test it...

Unless one of you nice chaps happens to know this?  Or have a stock  
radiator sitting idle to test with?

-- 
Jo Rhett /  velociRaptor Racing
#553 WERA West / AFM
#5 SMRRC