On my 1973 C337G, the hydraulic oil dipstick and filler port for the landing gear is located on top of the electric hydraulic power pack. The power pack on my plane is located behind a small access door under the center console which is just above the floor of the aircraft. Looking at your photo, if its located in the same place as mine, the access panel should be underneath your radar display screen. The dipstick is small, maybe 2 inches in length. You can add fluid through the same hole that the dipstick is removed from.
Ed
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