I've never heard anything about the speedcal frying speedos.
Can't tell you for sure its never happened, but it sounds more likely that some folks shouldn't be messing with electrical systems...
Also, ANY CAI kit on a near stock setup is very low on the bang for your buck scale. If folks want to spend 200 dollars for performance, there are much better mods out there...
__________________
Uncle Sam
"What the hell is up with all the gauges?
Calling Captain Kirk, your ride awaits... Phasers on stun...."