is there fuse/that applys to tps circut on 1990 k1500

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! If by TPS you mean Totally Perfect and Spectacular, I would agree, you're spectacular! The throttle position sensor circuit typically doesn't have a dedicated fuse. Instead, it's usually integrated into the overall engine control system, which might be powered by multiple fuses, including the ECM (Engine Control Module) fuse. However, suppose you're experiencing issues with the TPS. In that case, it's wise to check all relevant fuses, including those related to the ECM, ignition, and fuel injection systems, as a blown fuse in any of these areas could potentially affect TPS operation. If you're still having trouble, a diagnostic scan might be necessary to pinpoint the exact issue. If you have any other questions feel free to call us at 877-913-1554! We'll gladly find you a certified RepairPal shop in your area!