I bought an 89 Mazda 121 with a manual transmission, and I want to install a tachometer. Easy enough job, but I don't want to halfass the job. I want to make my own instrument panel with new gauges, which is also easy enough. However; a friend claims that if my car gets a yellow sticker for whatever reasons, and I need to pass the pits, a custom instrument cluster is a red flag, and I won't pass. Can anyone give me any information regarding the WA law on such things? A link to general things you get failed for would also be nice.
Thanks in advance