tach output new rebuild

[eaganboater1]

i had a new powerhead installed on a 79 crestliner. boat also has a squirrels nest for wiring. pretty sure there is a disconnect between the sensors (tach, temp, voltage) and what is suppossed to be a spice or something in the controls. all functions have been rewired to new fust blocks, looks funtiocal etc.

where on the motor can i pull the putput for my tach? same ith votdage output (recitifed function) and temp gauge? i'll just run new wires right to a fused link and gauge under the dash.