That's why I rarely drive mine on cloudy days, cloudy day gauge inaccuracies is really a thing.vary their reading depending on how cloudy it is.
rainy days and Monday's always get my gauges sadThat's why I rarely drive mine on cloudy days, cloudy day gauge inaccuracies is really a thing.
I put a new sender in which remained consistent. I also got a cheap mechanical which also showed the temp diff of 15-20 degrees between am and pm. Regardless, both are within norms, just interesting how this occurs!I would guess your sender is not functioning the greatest. Remember your gauge sender is in the intake manifold, therefore it will read the temperature that is modulated by the thermostat. It should get up to thermostat temp and then basically hold there (unless you are building heat to a temp higher than thermostat).
I would see AM and PM outside temps similar to yours and my gauge is consistent AM or PM. Saying that I also had my sender fail and it didn't work at all then.
When I replaced it, my gauge now reads about 10* higher than it did before (before was almost bang on the right temperature).
Another thing to check would be the connection at the sender. It is only a push on socket. If it is oversized it may not be making a good connection. If it is wobbly, try squeezing it a little with some pliers to get a tighter fit on the sender stud.
Let us know how it goes.
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