Ref: '70 220D.

About to make the change to the pencil type GP's. A couple of questions..

(1) I have 12.6VDC (battery voltage) that I read at the #4 plug, when I engage the 'gorilla knob' is this voltage OK to use for the pencil type GP's?

(2) Looking at a few vendors, Mercedes Source looks to have a good reamer,
does anyone have experience with this reamer? Or the conversion kit
he sells?

(3) Recommendations for pencil type GP's?

Thanks
Warren