I have dual system floor pump. When I use it with auto valve it is no brainer to use -- after attaching the pump I get the reading right away, I pump, with each stroke there is small spike in reading, but then pressure readings drops to around pressure in the tube. In other words oscillation is very small and it is easy to read pressure just after attachment or during pumping.
However with presta valve it is completely different story (I was wondering if it is my pump fault, but after some googling I see others face the same problem) -- after attaching the pump I have no reading (i.e. pressure is supposed to be zero), with each stroke there is huge spike in reading the pressure, and then the pressure reading drops to nearly zero again.
Two completely different worlds. I already read some tips about pumping, like slow, smooth, strokes so you could have time to read the peak pressure, but this does not suite me (I already blew one tube with presta valve due to misreading the pressure).
My question is this -- is this problem systematic, by design, or are there some pumps which can give the readings as nicely as for auto valve?