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Originally Posted by Lane Anderson - Mt. Pleasant, SC:

Probably oriented (by whom?) so that the redline is at the top.

 

If you've ever done any type of racing you generally never use the speedo but you watch the tach constantly, along with listening to the engine. That is why many guys either mark or rotate the tach up to 12 o'clock at redline it is easier to see at a glance how far you are wrapping your engine. When you are running flat out between gear changes it is very easy to over wrap the engine...bad and expensive things can/do happen when that happens.

 

My Smith's tach in the Cobra is marked with a 'yellow caution line' at 7200rpm and a red line at the engines rpm limit of 8,000rpm. The tach is rotated with the 7200rpm 'caution line' at the 12 o'clock position where it is very easy to see at a glance. The '55 Chev's tach(Moon Eyes) has a marker pin built into the tach that is irridescent red and is very easy to see, it is adjustable to any rpm. The tach is rotated in the cup mount to put the 6800rpm caution line(redline for this engine is 7200rpm) for the engine at the 12 o'clock position using the built-in marker, again easy to see at a glance.

 

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