i just installed a jdm Type r header in my 2000 civic si. I had them remove the cat and install a test pipe. the did it right by puttin in an 02 simulator and stuff. They also disconnected the battery when they did the install. However my cars gas gauge isnt reading out properly. Ive driven 82 miles since the install and the gas gauge hasnt moved past full. It only moves when i step on the gas. When i come to a stop the gauge goes back up. I also removed the negative battery wire and let the ecu reset and that didnt seem to fix the problem. I know my air fuel ratio changed but i dotn know why the gauge is all messed up...any help is greatly appreciated...thanks

Does anyone know the problem and how to fix it?

 

in for some info since my JDM cluster does the same...my gas gauge doesnt move at all...stuck at full...i pump when i reach a certain amount of KM...thats how i know when to fill...would like to fix it though, for now im using my stock cluster...