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www.tinytachcom has a universal unit for diesels which works off of a pressure transducer on an injection line for 125 $ US. It won't track hours, but we should likely change oil per season rather than on hours on these little unit anyhow. Way cheaper than paying 700 $ Canadian for a factory...

I had the same problem. So I tore it apart. The Tachometer is connected to the needle by a coupler with a viscus link...just like a torque converter. The oil that is inside ( assuming here... didn't part the coupler) must get cold enough that it locks up instead of slipping as it is designed...