Problem with stock , Autometer and Tweecer TACH

[Slow5.0]

Dang i didn't know my rpms/tach are this much off, before i got Autometer Phantom tach i was shifting by stock tach,and i had problem with shifting pass 6000 rpms because stock one (or neddle) have hard time pass 6000 mark and YES i have adjust rev limit on Tweecer 6300 on / 6200 off
So i was hitting rev limit all the time on track because i didn'r know where am I (shift points are 6200) so i decide to buy aftermarket 5" tach with shift light and because i already have two Phantom meters i bought Phantom one #5899
I have installed a few days ago and i adjust shift light on 6200 and tested on street a few times BUT i find that aftermarket tach goes to 6000 rpms when TwEECer read 6300 and i hit rev limit , i have datalog every time and every time i was hitting 6300 (at leest thats what tweecer record)

So something is off, why i hitting rev limit at 6300 on TwEECer when i'm 6000 on Autometer tach

BTW Tach i bought is brand new so there is no chances that tach is broken

 

[Slow5.0]

Anyone ?

 

[sociopath5.0]

I'm not really an expert, but how did you hook up the tach? Where are you getting your tach signal from?

 

[The NJ Exile]

Ernie,
1. Double check all the grounds.
2. Hook a Dwell Tach up and check the reading it give against with the stock and autometer says. Also the Dwell Tach can be used to trouble shoot your ignition.

I hope this helps, John

 

[Slow5.0]

Doesn't metter where tach is hook up because i tryed on ignition coil(negative wire) and on MSD 6A , I still get 200rpms lower rev limit then i set