if your talking coupler they sound like gravel in a cement mixer long before complete failure.
Does it idle?
can you drive it?
hold the bbv down and rev it does the gauge change?
for the love of god don't rely on the lego block oem boost gauge.....
vac leak umm spray carb cleaner around the base of the sc and see if the idle changes? spray the vac fittings and see if idle changes?
not to be a d1ck but these threads are worthless until the op gives more info....