\documentclass[]{standalone}
\input{./tikzpreamble}
\begin{document}
    \begin{tikzpicture}
        \node[anchor=south west,inner sep=0] (image) at (0,0) {%
            \includegraphics{../../pitstop/20180901/calib_v10_s.pdf}
        };
        \begin{scope}[x={(image.south east)},y={(image.north west)}]
            \node[fill=white, draw=gray] at (.8, .51) {
                \begin{circuitikz}[scale=1]
                    \draw[color=black, thick]

                    (0,0) node[left]{GND}
                    to [short, o-] (.1,0)
                    to [R, l_={R1 1k}] (.1,.1)

                    (0,.2) node[left]{9.6V}
                    to [short, o-] (.1,.2)
                    to [R, l={R2 3k}] (.1,.1)
                    to [short, *-] (.25, .1) node[right, draw=black] {MONITOR\_10V};
                \end{circuitikz}
            };
        \end{scope}
    \end{tikzpicture}
\end{document}