Shims are the way to go! I have my Forster GO gauge and a .0039” shim. I’ve also had .0025” & .003” shims. All are from feeler gauges to the same circumstance of the Go gauge. Works perfectly.

But yes... for inexperienced, just get BOTH gauges. I don’t recommend tape either, as tape compresses & it’s all different thicknesses depending on brand & type. Want a RIDGED stop on the gauges.