I agree. I think the boost gauge is one of the ones that you should spend more on. Its the most important gauge for moderately modded 3/6's. No point in buying a setup that doesn't read accurately. I bought a prosport digital boost gauge and it doesn't read properly. Its consistant so I know what to look for but it reads high.
If you are on a budget and wan't functionality than the dashhawk would be your best bet. Or you can buy a boost gauge and stick it in one of those cheap metal generic mounts. The flaps actually bend and fit nicely in the gauge cluster. I had mine between the tach / speedo and it was great because I could see it without looking down.