Speedometer is off
 

Is it alot of trouble/work to go and readjust the speedometer? The guy before me put in some white gauges and i was driving by one of those radar things the cops put out and the speedo read 35 but i was being clocked at 30 so i thought it might of been something with the radar. SO later on me and my brother went driving and drove past it, he was doign 35 and it read 35. I've notice in traffic that I can be diong the speed limit but people are passing me up. Any way to fix this myself? or do i have to go to a mechanic or something?

It's probally the white face gauges,not to sure if you can fix them though.

I installed some El Glo gauges awhile back and I had problems with the needle rubbing on the gauge faces. The came with some two sided tape for the install but it was too thick. I found some 3M two sided tape and it worked much better with no rubbing.