Swr power to regulated power supply

i have a Dosy tc3001-p Swr meter here , it has 3 - 2 1/2" meters on it with lights , this unit comes with a power adaptor that plugs into the wall and the other end
looks like a mono headphone jack (male) it unscrewes and there are the 2 wires + and - that are soldered onto the tip.
i would love to run the meter lights off of my Pyramid regulated power supply bu i dont want to fry my meter lights by sending to much power to them.
the power adaptor for the dosy meter , shows the following
AC Adaptor
Model: DV-1230
input: 120 VAc 60 Hz 23W
Output: 12vdc 300 mah
class 2 transformer



Pyramid Regulated DC Power Supply
Model # pyramid PS-15KX
-Input Rating
Input Voltage: 105-125VAC (115V normal)
Input Line Frequency: 60 hz
Input Power: 250W max

-Output Rating.
Output Voltage:13.8VDC + 0.3v
-
Output Current: 10 Amp constant / 12 amp surge
Output Ripple: 150 mV RMS

-Regulation
Load Regulation: 2.5% (280mV)
(note: input at 115vac and output at 10 amp)


i can just unscrew the tip of the swr meter cable and solder a new cable on it to go on my power regulator , but i thnk i would need some resistors , anyone able to hel me out as to exactlly what ones i would need to add ?

would really appreciate it , thank you
Mike

 

fixed all working
The wall adaptor i have have is putting out more than 12 volts i checked it , the lights just pull the amps they need regardless of how big the power supply so i hookedup meter lights direct to my regulator and boom all 100 %