ka24de aftermarket tach wiring

hey guys i found a weapon x 60mm tach that i had lying around…i would like to install it but have no clue where to hook up the wires

i have googled it numerous times and have gotten a bunch of different ways…ie. tap into ignition coil…or tap into a yellow and red wire

if someone could please help me out with this that would be awsome…the guage has a red…black…and a blue wire on it…would also like to know what the best spot to put the positive and negative would be

thanks

anyone got any info on this???