Found this searching here
Monromatic is a control box found on the right fender which allows tilting of the RHS 3Point arm.
and
Sooooo, yes, the Monroematic tractors had an adjustable hydraulic link on the RH side that could be controlled manually through a rocker switch mounted on the RH fender, but more importantly, the matching Monromatic rototiller had 2 built in "directional" sensors that would determined when the soil in a terraced rice paddy was uneven, and would automatically adjust the tiller depth to compensate. The sensor system plugged into the back of the tractor, through a small square white plastic plug in.