temp sensor

[surfer@prairieweb.com]

When I rebuilt the engine in my '71 fastback I ordered some rebuilt heads.
When I bought them I didn't know much about VW engines so I confided in the
salesman over the phone who said "as long as they were dual port they will
fit". Well needless to say I put every thing together and close to
completion I went to attatch the temp sensor and found no hole. So I
embedded it between the sheet metal and the head and it works untill the
engine gets hot and then the engine stalls.
I tried to attatch it to the exaust where it comes out of the head with a
hose clamp, but that doesn't seem to work either. Tapping a hole into the
head seemes risky and would be impossible without removing the engine.
How can I solve this dilemma? Am I truely stuck?

Thanks,

surfer@prairieweb