I tried cleaning my '85 tach and it didn't really help. Granted, it can get to -40F here but still. The tach will sit at 0RPM until the cab warms up. Most any grease or liquid lube will end up thickening up with colder temps, so it may not be a good idea to lube it. I lubed mine with the tiniest amount of synthetic grease but no luck. The assembly is VERY fragile so be careful.