What degree thermostat are you running? If your not kicking out any trouble codes I would not worry .At least your not running too hot thats the good thing .Some of those Ford factory gauges are not all that accurate .
My '94 shorty F150 runs on the N fully warmed up, new water pump, rad and Ford 192* thermostat.
My 1990 F250 Diesel doesn't even reach the N fully warmed up, and my 87 E350 camper runs on the M-A and real gauge reading around 185-190.
Stock dash gauges in these trucks are useless. Your reading looks perfectly normal for a warmed up Ford. If your worried, get a real gauge.
1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 152,000km/95,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 289,000km/180,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 677,000km/425k miles
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