The saved article verifies my hunch, Wallyman originally showed 3 different procedures, for the NA6, NA8 and '99 to 2003 gauge electrics. Thinking on this, I found motivation to dig into my files. I haven't calibrated my NA6 gauges, but reckon the flat part of Wallyman's '97 OEM curve is 'less flat' on the NA6s I've had, but not much. The gauge doesn't start moving til a significantly higher temp. This is actually worse than a simple 3 position switch, as the linear behavior up to 'normal' leads one to think the behavior at increasing temps will be similar. Zero response to see over the whole of the normal/safe temp range. The NA8 gauge response curve is disgustingly close to a 3 position switch, with a bit of activity at the top again. See below for the curves of stock, bare modified and with a 10ohm resistor in series. Most images in the link don't show, but some appear if you click on them, including diagrams of stock response curve, straight modified, and with several resistors added to the circuit. My files had? the series of pics of stock and linearized gauges vs temp (See below) The only hit in my duckduckgo search with "linearization" connected to OEM Miata temp gauge got the original article (NA8 version), but just the first page, not the pics of stock and modified gauge. Once into the real danger zone, it's roughly proportional again. The stock gauge responds linearily to each upward temp increment, till 'normal, then, not so much. The original article by Wallyman on linearizing the OEM gauge had a line of photos of the stock gauge, and actual coolant temp, and a line of photos of a gauge after the linearization mod to the gauge electronics. Rumors the stock temp gauge is basically a 3 location switch don't really jibe with instrument tests.
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