I got the MK1 yay

now I have a wiring question
shoudn't there be a yellow wire ?

also does anyone have a wiring diagarm for the MK1 anymore I downloaded the manual from the empeg site but it looks like it's for the MK2 (is the wiring the same ?)

every other head unit I have installed has
constant power

ignition
ground
dimmer
remote turn on / power antenna

this only appears to have ignition, dimmer, and ground
(red, orange, and black wires)
thanks