stupidcar
5,000 RPM
So have u tried this?simple solution
get a ic regulator lm7809 cost only <rm3
got 3 legs(connections) in, out, ground
just solder out -> red wire at s. tag
gnd-> black wire of s. tag (o volt or ground or car chassis)
in -> input or car battery
input range 10v ~ 30v and output is always 9v
can get the pin connections details online or pasar road sellet.
this is a simple diy..