[reble]

Thanks. Between what you told me Tom and what I will find out when the Windstar wiring manual that I just payed for on Ebay, when it arrives. I should be able to fix the gas gauge. As to the RPM and speed goes. I am not worried about the RPM reading been high. I can tell by my ear as to how the motor sounds. I used to do short hall trucking during the day while I went to electronics class's at night. The speedometer, I have a backup plain for that. A GPS receiver mounted on the dash and set to ground speed. An as for the temperature gauge saying the motor is boiling over when there is no other sign of boiling over. The temperature gauge jumps up to half way when the key is turned on and the motor is stone cold. I also have a spare instrument cluster that I got from a scraped outed 2000 Windstar at the junk yard. Now when I put the spare cluster in and connect the wires up. The motor won't start but the gas and temperature gauges don't act funky. When the backup cluster is in place the gas gauge says that I have a bit above a 1/4th of a tank left right now. That tells me that the problem is in the cluster. I shouldn't have any problems taking parts from the 2nd cluster to fix the original cluster.

Originally Posted by tomj76

Sorry, I don't have any photos of the module in the back of my cluster.

Here is a photo that I found online by searching "Ford Windstar Anti-slosh module":
http://www.supermotors.net/getfile/4...that-thing.jpg

The anti-slosh module is mounted in the back of the instrument cluster. There are YouTube videos that discuss it. Ford has several versions of the module, so the exact electronic circuit is different for each version. The actual schematic for the module (internal circuit) is not documented in the Windstar wiring manual. However, it is simple enough that you can visualize the circuit (or draw a schematic) from the layout. I believe there is only one diode.

The purpose of the module is to "steady" the gas gauge so that the needle doesn't fluctuate as the gas slushes around in the tank. The module also sets the low fuel warning light.

The module will only affects the gas gauge. Any problem that is also causing other gauges to move erratically will be due to a different problem.

The module converts the resistance of the fuel tank sender into a voltage, then it averages that voltage and drives the fuel gauge. Problems in the module cause the fuel gauge reading to be wrong. In my case the gauge said that I had 1/4 tank when it was totally empty. FYI, bad wiring and/or connectors can also cause a faulty reading. You can check the wiring by probing the fuel gauge sender wires that plug into the instrument cluster to see if a reading is present, and also by disconnecting the connector to the sender and checking the gauge with the sender pins shorted and open circuited (one will cause the gauge to read empty, the other full).

A faulty module can be bypassed so that the fuel gauge reads directly from the fuel tank sender. The reading is accurate, but fluctuates due to the gas moving around.

There are YouTube videos on how to do this. It is as simple as shorting out two pins on the module.

Search for "Ford Windstar Anti-Slosh Module" to find the videos.

Also, the fuel gauge can't move without power applied to it (current flowing). If the gauge moves when power is turned from on to off, then you might have another problem.