Very inaccurate, I can estimate RPM better than this thing. Tried several settings. This appears to be about double what it should be when set to 8 for an 8 cylinder engine. The arrow is not stable, it jumps. But it looks nice. Spend your money elsewhere. UPDATE: Spent another $15 on a recommended sensor signal filter. Some erratic movements have been calmed down, but the tachometer readings are still high. I bought an AutoMeter device connected to the same cables and it works great.
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