hi guys, im pretty new to this so i need some help. currently my car has an rb25 gauge cluster in it and Im running a rb20e so my cluster isn't working. i bought the car that way. bu i recently decided to buy a universal fuel gauge (0-90 ohms) so i can atleast know how much gas i have. but as I am trying to install it i am not sure where the sending unit's signal wire is. i thought it was in the trunk where the fuel tank is but i connected the gauge's signal wire to each one of those wires and it doesn't read correctly. so i thought that maybe the fuel sender unit's wire is somewhere else. again Im really new to this so if anyone could help me would be great thank you.