LT1 tach output issue, tach reads double actual
#6
or check the pcm and see if its an ls1 pcm or the so called 411 pcm retro fitted, that would throw it off also....
some place sells a box that converts the tack signal to work with the lt1 gauges if you have an ls1 pcm..
some place sells a box that converts the tack signal to work with the lt1 gauges if you have an ls1 pcm..
#7
TECH Fanatic
iTrader: (3)
Join Date: Sep 2004
Location: Clear lake TX (From LaPorte)
Posts: 1,417
Likes: 0
Received 0 Likes
on
0 Posts
The module lets you choose tach output and then you can also manually adjust tach with up and down arrows. Hope this helps. Based on what your saying about double speed makes me think you need to convert to half the cylinder output of whatever your pcm is putting out to your gauge.
OBTW I tried changing the pulses in HP tuners with no luck for some reason.