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It likely i snot witness tampering although it is certainly possible that the facts could develop to support it. If the judge finds that it was witness tampering then he would be inclined to sanction them strongly and may send the matter to the DA.
As to how to handle it the best way is to contact the lawyer that is representing the party that wants you to testify and ask them for their assistance. they may not be able to do anything directly but they may also want to file the Motion for Sanctions, etc.
You're not allowed to contact the judge directly at this point so your options are really to 1) contact the lawyer, 2) hire your own lawyer, or 3) contact the police although they are almost certainly going to tell you "it's a civil matter".
The lawyer may also advise you to contact the judge but if the lawyer tells you that then you wouldn't get into trouble for it whereas if you do it yourself you might/would.
If your question has been answered then I'd offer my best wishes to you and ask that you please not forget to leave a Positive Rating so I receive credit for my work.
Of course, please feel free to ask any follow up questions in this thread. I want to be sure that all of your questions are answered. In addition, once you issue your Positive Rating the question will lock open and you can come back to it anytime in the future if you think of something else.