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My hoses probably don't look like original equipment, but they have been working fine for ~6 years now. I think they are both 1 1/2 ID hose. The upper hose is just straight hose, the lower hose is one of those universal accordion-looking hoses that is easy to bend. Both hoses are cheap at just about any auto parts store. Radiator cap - not sure on that, I'm thinking it should be rated for 3 - 5 PSI. temp. sensor- I installed one a few years back. The sensor threads right into a port on the side of your coolant manifold coming out the top of your engine, you should see the square or hex head plug there now. Clean the flat seat at the bottom of that port real good before installing the sensor bulb, the actually sealing surface is the flat seat, not the threads themselves. Wouldn't hurt to use a dab of silicon gasket maker when you install. Measure the length of capillary tubing you need, you can get the exact length you need. If you get one of those "universal" sensors, the capilary tubing will be way to long, you will have to do something with it to keep it out of the way. I installed a sensor that said it was for a Ford NAA or 600 series, it fit perfect in my TO-20. Watch the thermostat, it should be in the upper radiator hose. You can push it in either way, but only one way is the right way. It should have a little direction of flow arrow on it, which should point towards the radiator. Install it backwards and your tractor will overheat in just a few minutes.
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