I have tried everything. I verified the sending unit is working properly by checking resistance in various positions. I confirmed electrical continuity from the sending unit to the instrument panel. I have a good ground on the sending unit. The flex circuit has good continuity along the traces. However, when I hook everything up as it is supposed to be, turn on the key and manipulate the float, the gauge does not move. I do not have a few of the engine sending units hooked up (water temp, oil pressure) because I recently switched to mechanical gauges but i dont see on the schematic how those should affect the gas gauge.