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yeah the stall test is far from accurate, but you can tell within a few hundred RPM anyway. The lazy tacho can generally be convinced to work by a repeated light tapping on the dash. Or a permanent fix is to pull it apart, resolder the dry joints and lubricate the needle (as if I've got the motivation to do that). So, tomorrow morning be sure to listen to the scanner for a copper reporting some freak pulling a linelocker while staring intently at the tacho and tapping the dash with one hand.i thought about doing a stall test but thats not accurate,if my auto starts to slip or the wheels start to spin then its out.
also my tacho is kinda lazey at idle it sits on about 300-500 rpm most days and some days it sits on 1100-1500 rpm i had a tacho scan tool on it when it was on the dyno and its out/lazey it was reading about 6000rpm and the scantool was showing about 5500