I recently bought a 1990 SC and the temp gauge doesn't work, the rubber boot connector on the temp sender was missing so I bought a new connector and temp sender still nothing, I also replaced the coolant sensor and still nothing the fan kicks on but the temp gauge doesn't move it stays at cold, when I jump the wire from the temp sender it makes the gauge read hot so I don't think I have a broken gauge, I'm not sure what's going on