Engin's running too cold?

[dom14]

Having just fitted an extra water temp gauge, I can tell you
the after market gauge and the Ecu-Talk are pretty even
BUT when the OE dial shows the motor at running temp it is in fact
only 60-70 degrees on the gauges, well below my 85-88 operating temp
Hope that made sense lol

So, I shouldn't take the OE dial reading as accurate?
I do have an aftermarket coolant temperature gauge with an alarm buzzer, but have never got around to install it.
May be it's about time I install it.