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What year is this your working on please?
Have you scanned the system to see if there are any fault codes setting?
Okay doing so would be a good idea to help determine whats going on here. That being said the tachometer gets its signal from the crankshaft position sensor located in the block behind the compressor and its common for them to fail but you will usually get a code indicating a failing Crankshaft position sensor.
With out checking for fault codes its a bit of a gamble but for the price of a new one its sure a good chance that will solve the problem as well. See the location and removal steps in the link below as well. Have a look and let me know if you have more questions and or need more help .https://dl.dropboxusercontent.com/u/104923897/Crankshaft%20position%20sensor%20Jan%2028.pdf