Need help with tach install - 5 in. Tach
https://ls1tech.com/forums/showthrea...ght=brown+wire
Should be the brown wire on the back of the headlight switch. A grey wire on the radio/TCS/ASR switch. Search "this forum" (Stereo and Electronics) for some of the following.
- illumination
- gauge lighting
- brown wire
Good luck.


