CJ750 toolbox
Nitros oil temperature gauge installation by Ross Kowalski
I wasn't planning on installing an oil temperture gauge, but the Harbor Freight Tools store had them on clearance for $10 July 2011.
This is the oil temp gauge that I got and the included sending unit, it is a Nitros brand.
First I made sure I had a drill for the 1/8 npt tap I would need to mount the sensor in the crank case.
Loosen the drain plug to drain out the oil.
Because I was going to reuse the oil, I put it into a pourable film developing tray (Film was something the dinosaurs used to take photographs)..
I located the two oil pan bolts in the front sidecar corner of the block, and marked a point between them.
I drilled the holes with a greased drill to collect chips.
Even with the grease, when I was almost through, I stopped and removed the chips from the drill and regreased it.
Of course the drill died at the last minute. I put the drill back on the charger, and now the race was on. Ross installing the temp gauge vs the DeWalt charger charging the battery pack.
Out comes out the corded drill to tap the hole. (What dinosaurs used to make holes, odd that I own both a film tray AND a corded drill).
With the hole tapped I put sealer on the threads and screwed in the sensor.
Here is the sensor installed, I put it about 2cm from the bottom of the crankcase.
Time to put the oil back in, so the funnel gets the strainer.
Good thing I used the strainer.
Remove the headlight.
Take out the testlight to figure out what's what.
Clipping the test light to a ground.
A good practice is to check that the ground is good by checking a known positive source. The battery terminal is about as good as it gets.
The lower power rail in the headlight nacelle is positive on my bike.
Strip back the insulation a bit to make installation easier
There are five wires, though in practice there are three. The white, orange, and red wires are all some sort of power. This way, the light is always on and the gauge (which is capable of color change) cannot remember the color you set it to so it is always green. I don't care to figure out what is switched, what is lights, and then have parasitic power loss just so I can have the color stay set. The black wire is ground, and the green is to the sensor.
The sensor has a red and black wire. I wired the black wire to the ground rail in the nacelle and the red wire to the green wire from the temperture gauge.
I took the bike out for a quick ride trying to get it hot, revs-load-slow, it wasn't long before it started showing 180F.