I followed your suggestion and bought the whole thing

Now we are getting somewhere. For float service set the supply at 13.30 volt in normal conditions and let it sit. For fast charge set to 14.8 volts and give the timer a twist from 30 to 180 minutes depending on level of discharge. (about 10% to 50% discharged respectively)

I am not an expert on Megawatt so now everyone can jump on me with corrections. :B

Not sure how the meter fits in.