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IF High resistance = Hi Gauge Temps, here's a tip.

The Nut that holds the brass sensor in, tend to oxidize up, clean the nut and wire brush the seating area. Use Thomas & Betts Copr-Shield or something like LOCTITE C5-A Copper Based Anti-Seize.

BROKE ?
Get out the "Mill-Smooth" file and make some copper dust, mix with grease and there ya go.

BTW, T&B's Kopr-Shield is great for batter cables as it does not run, C5-A does tend to run a bit.
One application method for either on electrical, is on a CLEAN SURFACE, put a BB's worth on a rag and "burnish" [waxing like motion] into the accessible areas.

Rusty Wrench