I have the subject tractor. Low oil pressure light comes on a lot, but when a (borrowed) oil pressure diagnostic gauge is connected, pressure is fine, leading us to believe sensor is bad. Engine is a 4-cyl Mazda. Would love to purchase inexpensive after-market oil pressure gauge and mount on tractor, but diameter and thread pitch of sensor are not standard 1/4" or 1/8" as is sold with these gauges. Thread pitch is obviously a fine, metric. (Adapter that came with borrowed gauge worked fine, but no markings for us to identify for purchase.) Thought we might use a Mazda automobile oil pressure sensor, but which Mazda engine is similar/identical to the one in the tractor? Would rather have a gauge anyway, but would settle for a replacement sensor if we must. Tried local IH store. Tractor is still listed with some parts available, but not the sensor. Tried on line for antique/used tractor parts, but frequently 284 is not even listed. Any suggestions would be greatly appreciated. Thanks.