Doomking,

You do not need to find TDC. The following works well, as recommended by RC Showcase, for positioning the pick-up on a 40 RV. The RE may have different timing, I do not know.

Place the engine on your bench with the prop-drive facing you and the exhaust port down. You will be looking directly down on a web cast into the side of the case. Measure 6mm to the right of the center of the web. Make a mark there. Mount the pick-up centered over that mark.

You got it!!