Installing new Autometer gauges

hemibadfish said

my car is a 68 Barracuda with rallye dash

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Go to MyMopar and download yourself a service manual

MyMopar - Mopar Forums & Information - MyMopar Tools/Reference

http://www.mymopar.com/downloads/servicemanuals/1968_Plymouth_Service_Manual.zip

Also there are aftermarket diagrams which are sometimes easier to follow but may not be as detailed

http://www.mymopar.com/downloads/1968/68BarracudaA.jpg

http://www.mymopar.com/downloads/1969/69BarracudaB.jpg

In the factory shop manual, the instrument panel wiring is 8-112, page 339 in the manual