[OrrieG]

What I learned today, maybe will help someone else.
1. TH350 cooler pump does NOT have enough back pressure to fill a temp gauge fitting tilted above horizontal. Pulled the temp bulb and it was dry, strong armed the fitting below vertical and it started leaking, so hopefully that will solve the no worky problem. Did test the gauge when I had the bulb out its fine.
2. A tach power wire needs to come from a switched circuit, if it is on a non-switched circuit it will drain you battery in about a week. Murphy's law dictated that the last fuse out of 21 I pulled was the problem one. Anyway, now no more power draw, tach manf offered no reason it pulls power when not running.