Scanmaters Accuracy

[86WH1TType]

Whats more reliable? My Analog Gauges or my Scanmaster?

RPM-Scanmaster reads about 500RPM More then Tach.
MPH-Scanmaster reads 1 more MPH then Speedometer. (not to worried their)
Coolent Temp-Gauge reads about 50 degrees hotter then Scanmaster. Scanmater is usually about 170 (I like that). Gauge shows 220-230. (I dont like that).

Is this probably the cause if cheap gauges or is my scanmaster getting false readings?

 

[Razor]

Scanmaster only puts out the info your ecm puts out. So it only reads what your ecm reads.

I trust the ecm more than some cheap guages. Guage is only as good as the sending unit for it.. and then comes the guage itself.

If you have a bad sending unit, then you have bad data.

HTH