Question about Engine RPM\'s for an 87 350EFI I'm looking for tach's, factory or aftermarket. I'm wondering what the red line would be for a stock motor? I remember in my Dodge I had a SunPro 8,000RPM tach and it moved VERY little. I'm looking at the 5000RPM tachs in the 2-3" range with at least 180-200Deg sweep. Something like this AutoMeter 2967 2 1/16" Or the 2891 2-5/8" 6000RPM tach QUESTION IS, What is the RPM range for a STOCK TBI350 for an 87 or the like Blazer/Truck? Should I get a 5K or 6K RPM tach?