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Skywalker, is it a mechanical type gauge with a thin tube like ran down to a sensor in the engine or an electric gauge with a wire ran down to the sending unit in the engine??? If its an electric gauge, first make sure when shes turned on theres hot voltage present on the gauges input (NOT side to sender) terminal????? ??? Shes gotta have voltage there to work if its an electric gauge. If it does have voltage there, temporarily flash ground its other output (down to sender) terminal n see if the gauge deflects??? Or ground the wire thats connected to the sender. If a ground on the gauge makes her deflect but she never does otherwise, FIRST make sure the wire down to the sender is good (i.e. see if grounding the sender terminal makes the needle deflect) and if it is, then I suspect the sending unit is bad. HOWEVER if theres voltage on the gauges input and a dead ground temporarily flashed to its output dont make the needle move, I suspect the gauge itself may be bad. Also theres gotta be coolant present where the sender is (electric or mechanical gauge) for it to heat up n work. Make sure theres no restrictions or obstructiosn not allowing coolant to be at the level and location as the sender is !!! John T, retired electrical engineer
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