i agree with fitting digital,so much more accurate than a needle dial,never put tap water in your coolant system .To stat with,use battery top up water de-ionised,all them water wetters or radtec cool boost is crap,no stat, large swirl pot,impeller on water pump cut off, run electric water pump,and most important of all de-ionised minerali,capiche..i dont know if i can post pics as i am not a gold member,and have no intention either...