You can use fuse 13 for the lighting (this is the dimmer fuse). YOu can use almost any key-on 12 volt source for the tach - I let the mounting location determine what wire I would use.
If you choose to use a fuse for the power source, I would install a small fuse on your new power wire in the event of an issue with your new wire or the tach (so you dont blow the fuse you sourced power from).
Ever since I hooked my MSD BTM for the s/c, my tach is reading lower than the stock tach and when I get on it the needle is all over the place. I have it hooked up just like you Rolan, what gives?
Ever since I hooked my MSD BTM for the s/c, my tach is reading lower than the stock tach and when I get on it the needle is all over the place. I have it hooked up just like you Rolan, what gives?
What is the BTM? If it has a harness to the coil, hook the tach up to the harness I would think. You don't want an MSD box going straight to the tach. I believe you're supposed to hook the tach up before the harness... anyone know
also try to ground the wire to the fender or somewhere instead of the dash panel
The BTM is the Boost Timing Master that came with the Vortech s/c. It has a vacuum port to pull out timing according to boost levels.
So I still have the tach hooked up to the coil like before, should I try hooking it up to the MSD connector? The BTM came with a new harness that goes in between the coil and stock coil connector.