FYI Gene Berg sells those dipstick oil guages too. Very cheap (compared to
all of his other stuff, and pretty useful IMHO

>>>
>>>      About the dipstick oil temperature guage..... I had one on
>>>my '67 bus for many years.  It was electric, not mechanical like the one
>>>on my bug.  I thought it was great.  No problems; I bought it from
>>>J C Whitney.  Just one data point for you.
>>>
>>>                              Forrest Minor
>>>                              flminor@clark.net
>>>
>
>I made one for my 71 beetle years ago. I found out that oil temp was
>lower running on freeway than in town. My vanagon's coolant temp has
>similar effect. The temp gauge tends to go slightly lower on flat freeway
>(not hills) than in town.