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fuel gage and also speed doemoter on 1991 Jeep Wrangler

we have replaced the fuel gage but cant figure out what wire goes to it ?! i dont know which one it is. and also i have a speed odemter doest work did but didnt the next day and still dont what could be the problem? plz help

Asked by for the 1991 Jeep Wrangler
The fuel gauge usually has a blue wire, sometimes with a white tracer stripe on it. The speedometer could be your vehicle speed sensor located in the tailshaft housing on the transmission.