Temp Gauge w/ 6 Pak Manifold

Does anyone have any ideas on installing a mechanical temp gauge with a mopar 6 pak manifold. There's only 1 port from the factory and the hole is smaller than the element for the gauge.

Am I stuck having to run an electrical gauge ??? Not a big deal, but would prefer mechanical.

Thanks

i have an extra 3/8 npt fitting in my rad, opposite the top hose. if not you could put one in. or tap the manifold. that's a hard one.