Rail Pressure Guage reading backwards?

Coal Train

New member
Joined
Mar 13, 2008
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239
Hooked the gauge up tonight checked all connections and made sure everything was hooked up correctly. When you start the truck it goes up to 22K rail pressure when you rev the truck up the gauge goes down 21K, 20K 19K when you let it go back to idle it goes back to 22K??? I'm lost guys this should have been a very simple hook-up.
 
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