I am using MS3 for my ecm and did not the step function of dimming when used with integrated module so I found on Amazon a pulse width modulated dimmer that
works well. Google "dimmer 12-24, 8 amps. Sold all over but I found for $2.66- pretty cheap and it gives a continuous range of dimming. See Utube video:

https://youtu.be/Zn1ZW3E8uJg

IMG_0338.JPG

I took pot which is 10K and remote mounted it in dash just like prod cars. You could also use the pot on the column stalk- same 10k but get step function.

I took video showing inside lamps to see dimming better. May take while for utube to process video.