Never replace all the external bits when you do an engine.
Water pump, if it's got a problem, okay, or if you know the new one is right.
You replace the senders, now you have gauges reading wrong, and where do you start looking?
I had more guys work for me who wanted rebuilt starter, alternator, carburettor, fuel pump, new senders, yadda, yadda, yadda, and when it wouldn't start or run right, where do you start looking?
Put all the old externals back until you get it going, THEN if you have a problem (carbs, starter, etc) change them one at a time and see what it works like.
I mean, yeah, if you had known carb issues, get that done, but if it started, and ran, and the gauges read right, now what do you have?
Do you still have the old sender?
Keep the old ones, in the original box, labelled "old-good", you now know what is in the car (part number and source), and you can swap the old one back in if you suspect something ain't kosher.