Can anyone help ? Every time I wash my bike the tach quits for a few months . The needle pins when ignition is on & moves while cranking then goes to 0 when running . Have wrapped module in a plastic bag & seems to be well hid under gas tank . Does not seem to be in the head ( gauge ) . Seems to be missing the signal from the data link but speedo works fine . Harley after market tach purchased from dealer . Not a fair weather rider , just keep clean between washes . Thanks ! Ken