Your electronics will be more stable at higher volumes, and will not interfere with your original tone.
In fact, these guards work very well on the best guitars for recording.
FITS - HSS Pickguard fits most genuine Fender USA & MiM HSS Strats. Or any Strat SSS when bridge single coil changed for humbucker- American, Mexican, Standard, Classic, Hot Rod, Deluxe, Special, Lonestar, FSR, Power, Road Worn, Vintage Modified, Modern Player.
Squier Strats - Will fit Squiers, with maybe 1 or 2 screw holes a little off centre. That's usually no problem, the screws supplied will easily find a hole.