fuel and temp gauge

so my fuel and temp gauge just stopped working i was wondering if you guys had any pointers or any tests or wiring digram. looking in this general repair book i have for old cars and it shows these two gauges going through the voltage regulator was wondering if that was true or not i have a 1969 dodge dart with a 273ci with a auto. any place to find wiring diagrams online for free or a good site i can pay for to look for this stuff

thanks matt
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