For more, see the Stewart Warner tachs http://choosingscars.blogspot.com/2009/05/stewart-warner-guage-advertising.html and Airguide tachs: http://choosingscars.blogspot.com/2009/05/airguide-tachometer-advertising.html
Sun tachometer ads from the 1950's and 60's
For more, see the Stewart Warner tachs http://choosingscars.blogspot.com/2009/05/stewart-warner-guage-advertising.html and Airguide tachs: http://choosingscars.blogspot.com/2009/05/airguide-tachometer-advertising.html