I'm having the same problem with the MSD RTR distributor rev limiter. My car is a '68 Firebird with hood tach. Tried setting it according to instructions. The tach is supposed to show what rev it is set to when you turn the key on. Nothing happens on my tach. When I took my car in to be dyno'd we tried to set it again but still got the same result. The dyno operator has worked with these units before and felt the limiter was set, just not showing up on the tach. I'm not really comfortable with this and plan to reset the limiter to a much lower rpm to see if it's really working.
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