Super easy
1 wire through firewall to neg side of coil.
Get your power from a keyed source at fuse box.
Then get a good ground close to where you mount the tach on the dash frame. Scrape paint off for good ground
For lights you can take the pos from the illumination wire from your radio and the ground can go to the same as tach ground.
If there is an open spot on the bulkhead connector that would be a good place to route the wire to the coil
