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There is no VSS unit on a Metro. It is just a mechanical switch that is activated from the back of the speedometer. The VSS on a metro is only used for that idiotic door locking thing on the 93/94 and going to the computer to let it know how fast the car is going. I guess it could also be used for cruise control if someone is lucky enough to find a car with cruise. It is just switching 12v on and off on the wire. So everything connected to that wire can handle 0-12v.
So you can't really hurt it unless you just burn up the switch by grounding it out or something, even that would probably just blow a fuse. Just as an educated guess I would probably just go with a slightly higher value resistor on the ground side than the 12v side. If that didn't clean it up I would use a capacitor on the ground side with the 12v to vss resistor still connected. As these cars get older the reed switch is just going to get worse. So ultimately a new switch might need to be found and put in the cluster if it can't get cleaned up any better.
I have my cluster out right now doing some random work on my car so if I get time I will see if I can figure out where to order a new part from and see how big of a job it would be to change. From what I can remember it was a pretty simple design so it should be easy to put a new reed switch in the cluster. As these cars start passing 250k miles and 20 years that switch is probably not going to make it a lot longer than that and will need replacing to keep the mpguino working.
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