autometer tach and dash tach,which one is right?

Rynb15

Member
Nov 21, 2005
132
2
18
I installed a autometer tach the other day. Well yesterday i finally got out to play with the 5.0. I noticed when i get in to the higher rpms, above 5k they are diff. The autometer guage keeps pulling at the same speed and when i hit 5800 on it, the dash tach reads 6300:eek: but when i watch the dash tach it goes from 5300ish rpms to 6k almost intantly. I would imagine the auto meter guage is right. I hooked it up right to the coil. Just needing some feedback :)
 
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My tachs read the same till about 3k, then the stock tach climbs much faster than the autometer. When i hit 5k on the autometer, my stock reads over 7k!!
I'm sure the autometer is more accurate or i would have replaced about 12 engines by now!