For the tape, I simply use standard low-tack masking tape, cut to size- I can generally cut a strip as thin as 3/32" and it will still behave. With this I use a standard mechanical pencil, and if I need a super fine line, I just take a piece of paper and scribble on it for a minute until the lead has been shaped to have a sharp angle to it, then use the narrow edge of this lead to draw the line and re-sharpen on the paper every time I have to reposition the tape.