Tell us more about this gauge install ...........
I started a project some time ago to add and engine oil pressure gauge and coolant temperature gauge to my 2016 P1000-5D. I had to break this into TWO parts, because, according to the site it was "too long to post" This is part 1 with part 2 to follow.
The lack of an actual engine oil pressure gauge was troubling. The Oil pressure light on the dash is actually controlled from the Main trans pressure sensor or the "Clutch Line EOP Sensor". This sensor does not actually read the ENGINE main gallery oil pressure as the trans clutch pressure circuits are almost completely separate. The HONDA system works on the ASSUMPTION that if you have trans clutch pressure, you must have engine main gallery oil pressure. This can be a bad assumption in some cases. For instance, you might have a serious failure of some part that is exclusive to the Engine oil pressure circuit, like a stuck pressure relief valve, damaged engine oil pump, bearing failure, etc. You CAN have Good clutch pressure and still have low engine main gallery oil pressure (ask me how I know this to be true).
I Bought some suitable gauges from Amazon. I went with electric gauges on this install. I did test with a mechanical gauge but found that getting the oil pressure line run to the dash was going to be a pain. It was just much easier to run the sensor wires. The gauges I got were not the cheapest, but they also were not top of the line. These gauges have the ability to indicate with both a dial and an LED digital display. Illumination color of the dial faces is controlled by a push button on the front of the gauge. You can select from many colors. The picture above shows the "white" gauge color. These gauges are actually stepper motor driven gauges, so should be more vibration resistant. Spend as much as you like on gauges.
After getting the gauges, I designed and 3D Printed a mount that fit into the upper cubbyhole on the dash.
The panel is secured to the dash with two screws and is easily removable for service or replacement of gauges.
I fabricated an adapter to go from 8mm thread on the main oil gallery plug to 1/8 NPT to allow the pressure sensor line to mate to the oil gallery. I used the rearmost plug as it could be easier to access without removing a lot of parts. Still not a perfect solution as it does get in the way of the dipstick. This may bother some people, however, I find the dipstick pretty much a joke, and the engine does not use or leak oil. I just change oil regularly, add the correct amount of oil to the oil tank and send it, never had an issue. I can disconnect the oil pressure sensor line if I want to use the dipstick. No big deal either way. I used to oil pressure test point in the red square. You could access the one below the starter, but this requires more time and makes changes difficult if something goes wrong. This is still a test, after all.
see part #2
