OK lets check them,,,first make sure eng has ground to cab and cab to frame...make sure you have power to dash gauges...on the temp gauge,,with ing on gauge hooked up read gauge,unhook eng sender do not let it ground read gauge,ground sender wire read gauge,,gauge should have moved full sweep with wire unhooked then wire grounded,,if not wire to eng unit bad ((unhook wire at gauge use jumper wire do same test with jumper))or temp dash unit bad or no power to dash unit...do same check on fuel gauge...doc