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    Speedometer is inaccurate? How to recalibrate?

    My speedometer is extremely inaccurate. For example, with the speedometer reads 75mph, I'm truely going 55mph. And when the speedometer reads 105mph, I'm actually just going 80. How do I go about fixing this? Thanks. (1988 Toyota Supra non-turbo)
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    How many pounds of boost can you run on a (mostly) stock 7M-GTE SAFELY?

    Okay, so the only thing I plan to do is replace my head gasket, replace the stock bolts with ARP bolts, and torque them to 75 pounds. How much boost can I run safely with just doing this and without rebuilding my bottom end?
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