It looks like you might have a fuse out because it takes two to run the cluster and tach. Here is a cluster wiring diagram and a guide to help you check for power and ground and also a signal from the cruise control which is where the tach gets its signal from.
Please let us know what you find. We are interested to see what it is.
Cheers
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Tuesday, February 8th, 2011 AT 5:28 AM
BJEDGES
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Thank you I did some testing from the guide you gave and found the tachometer has bad I was able to un-solder it and install a new one from a used cluster. All fixed