That's what Erik does - test things properly,he'll spend 3 days making a test rig for a 2 minute test.The thermostat will behave differently in the bike than in a cup of water,so don't expect it to be exact - one trick we do is to suspend it in the water with a wire (I use my thermocouple wire),it will drop off the wire when it opens,easy to see and check the temp.Your temp sensor only does the light,so it may just switch at a value - but to test temp sensors I use a graphing meter and will show the gradual change in resistance as the water heats up,and any drop outs are obvious....this is important on modern cars as the computer responds to these glitches.
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