here is another question! my oil pressure gauge does not work. let me rephrase that. when i turn the key on it goes to the 1/2 way mark... when i turn the truck on it goes to 0. i know i am getting oil pressure, or at least i think i am. i drive it and it has not blown up yet... i would like to know where is the first place i should go to try and trouble shoot this. all other gauges work fine.