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01cvcluster.jpg | Hits: 4819 | Posted on: 7/4/06
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'92-up Crown Vic clusters (and probably MANY others) have a factory 5-terminal "anti-slosh module" inserted in the back which does 2 things:
1) slows down the needle so it doesn't show a drop in fuel level for momentary conditions like an extended turn, and
2) grounds a discrete circuit when the average fuel level is below ~1/4 tank.
This ground circuit is connected to a light bulb that is always energized (B 12V) when the key is on, so when the module grounds it, the light comes on, indicating low fuel.
Some other vehicles like T-birds & Cougars have an 8-terminal module which also monitors the oil pressure & coolant temperature circuits. A low reading in any of them triggers the light, which in those vehicles is labelled "Check Gauges".
See the NEXT several captions...
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