Coolant temperature fluctuations normal??

[NardDog]

If no coolant leaks to the ground then its a possibility its leaking from the inside , keep an eye on it and if its a drastic leak that you cant see puddling on the ground then you make have a bigger issue.

 

[rdezs]

Scary thought. Low on coolant and an oil pressure gauge not working. Is it really not working? Or do you have coolant mixed with the engine oil thinning it out to where you have no oil pressure? Better start checking things out. I'd start with an oil change and see what comes out from the drain plug first.