The ones i bought are supposed to respond very fast and have a remote or face mounted switch for memory/max recall. I haven't actually used the ones i got yet.... so i can't speak to response time.
They are hand made to order, not off the shelf. They can put custom faces in, install any range you want different colored needles/numbers etc. $160 per if you order 3 or more, $200 if you just want a "one of deal"
Unfortunatley i can't remember the name of the company that sold them to me... If you search for my old build thread (beginining of the end) it has pictures of the guages.
Hope this helps, Later