S10 2003 odometer problem

[killer_mike]

Hey d00ds, the truck is acting up, when you turn the key half way the speedo comes on, also when the truck is starting; once the truck starts, the speedo goes out. I waited till night fall to check if its the dimmer thats faulty but the gauge cluster lights come on an everything else, i checked the fuses too, found nothing, even used dielectric grease on some connectors.

Help anyone, im selling the truck, so i want to sell it no problems to the buyer, or not to give chance for someone to say 'but...'