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Pete, until you get an mph speedo there is an easy way to calculate speed.  First, the ratio is 0.62mph/kph, which of course means 100 kph is 62 mph.  Also, when in 4th gear you can take the tachometer reading and double it to get a very close approximation of your speed, so when the tach is reading 30 (3000 rpm) you're traveling 60 mph, 35 = 70 mph, 25 = 50 mph, and so on.

Last edited by Lane Anderson

"Being one who was raised on the Imperial system (inches, feet, yards, miles, ounces, pounds, etc.) I find myself doing the above conversion constantly, even when riding my bike.  "

Me, too.  I just look at my speedo and see, in my mind's eye, my old '57 Beetle and I just know from the angle of the needle that I'm doing 35 or 45 or 65 - the only speeds I needed to care about back then.  Anything over 65 is current "Turnpike Speed" and all of those cars in my mirrors are waaaaaay behind me.    

Pete, until you get an mph speedo there is an easy way to calculate speed.  First, the ratio is 0.62mph/kph, which of course means 100 kph is 62 mph.  Also, when in 4th gear you can take the tachometer reading and double it to get a very close approximation of your speed, so when the tach is reading 30 (3000 rpm) you're traveling 60 mph, 35 = 70 mph, 25 = 50 mph, and so on.

After fixing my speedo, I did a 10 mile check using the mile markers by the highway. It was pretty accurate. Since, I've become very good at my 6X tables. 

100kph =~ 60mph, so 10 mph=6mph, hence 50kph = 30mph, 80kph = 48mph, etc. it's become almost second nature. 

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