I recently had to replace my MPEM coz the 5 amp fuse on the old one kept burning off. Ever since the new MPEM has been put in everything else works but the RPM gauges. When the engine is off the gauge needle moves above zero slightly and drops backs to zero when i put in the DESS. But start the engine and i get no reading. Any ideas? I've checked all the connections and fuses and everything looks fine. The speedometer works too.