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Originally Posted by jveik
do they make replacement speedometers for 73-87 chevy trucks that go higher than the 85 smallblock factory one or the 100 big block factory one? I want to see if i can get one that goes up to at least 150 or 160, so i know for sure i will always know how fast my top speed is. the motor will probably wrap out at about 140, so i want just a little cushion zone lol. anyways, if they do make this replacement, do they make it look like the original, right down to the orange needle and the font/size of the numbers? That would be sweet, but i guess if it doesnt exist, ill have to pay someone with a fast car to drive beside me and tell me how fast i got lol... 
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Your best bet would be to get a good tack/tachometer and just figure you speed from that.
And you can see what rpm your engine is running also.
Mt