dphc18

iTrader: (5)

I did a LS1 swap into an LT1 car and change the entire harness and gauge cluster to LS my volt & temp gauge are working but the Tach is not any ideas or can someone tell me where the tach gets its signal so I can check that wiring.

psiconversion

iTrader: (5)

Are you getting the TACH signal from the Class 2 Serial Data?

Jon
PSI

itsslow98

iTrader: (18)

Yea me and Jon^^^ worked on this for my swap. Just splice the Class 2 serial data line into the grey wire on the cluster I believe its like pin B9.

Here is a small write up I did on the cluster swap.
https://ls1tech.com/forums/conversio...ow-inside.html

dphc18

iTrader: (5)

PSIconversion: I show RPM's on a scanner just not on the gauge,

itsslow98: I change the complete harness from a crashed 99 into a 95 so I don't see why I would need to do what your saying even the cluster belongs to the harness its just not working

itsslow98

iTrader: (18)

If thats the case then maybe the cluster is damaged internally. The cluster recieves a signal from the PCM and interprets that data inside the cluster, it then displays the info on the gauges. Sounds like you may need a new cluster.

Dillon93dillon

http://lt1swap.com/lsx_tach.htm

this link here might possibly help solve this problem