Depends what gauges your after, mechanical, electric etc. Stack mechanical ones aren't expensive. The pro ones are good and pro stepper ones are ridiculous and i dont see the point of them at all.
Stack are good, as paul says expensive but i like the look of them more than anything. Stack themselves are dicks as well. If you get a slight problem with something say a rubber sleeve that connects the boost gauge pipe to the t-piece thats plumbed into the vacuum, and it splits they wont sell you one separately.
There is someone that does oil pressure and temp in same gauge, is it race tech or something?