Maybe I can help a little they are right it is one unit. How ever each one has a sendding unit and are fused. Your temp gauge has a sendding unit your speedodomder works off a cable. I'm resorring my first car 87' camaro none of the gauge work ex. the speed. No gas, no temp or oil replaced sending units they work now but they not cheap. I got tried of running uot of gas I'm a bad guesser.
Hope I answered your proplem.
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