Check Gauge Light

[Sbraman]

Recently the Check Gauge light has come on in my 06' Dodge Ram 1500 Big Horn.
I've checked everything related to the gauge cluster/dashboard. Oil level (and color) are fine, coolant levels are good, tranny fluid is good and i have just installed a new battery and starter (so the volt meter is good as well)...
The only noticeable thing is the tach not working properly, although i have to add the tach in this truck has never worked properly. When idling the needle will rest at 0 rpms and slowly increase as i drive/rev.
Ive checked the engine rpms vs. the tach rpms with an OBDII reader that shows live updates.
And everything is working properly...
Is there anything else i could miss?!

 

[MADDOG]

Have you checked for Diagnostic Trouble Codes (DTC) with your scanner or had any codes read at an auto parts store?

 

[Sbraman]

Update...
I'm an idiot, the problem was the gas cap not being tightened down all the way.
I just checked it on a whim and noticed it wasnt tightened. Check Gauge light went right away.
Thank you for responding so quickly @MADDOG
Sorry for wasting you're time lol

 

[MADDOG]

No worries at all. I'm glad it was an easy fix.

 

[JonnYuma]

Since we're here, what does everyone like for a basic scanner?
I used to have an Accutron but it got loaned-out a long time ago and I'm pretty sure it's a goner. Also, it's been several yrs since I've even owned a vehicle new enough to need one... I'm sure they've improved and changed a bit.