What is the difference in these two cobalt gauges?

[95EclipseGST]

Im trying to buy a cobalt oil pressure gauge and here is a link to which ones im looking at and cant tell why one costs $75 and the other $189. I want an electric and the two are both electric, and i see that they are both 0-100psi, but the $189 guage face has more of an around the clock range. Is this the only difference in why the price is so much more? It deosnt say that the more expensive one comes with an oil pressure sending unit, so why does one cost twice as much? The oil pressure sender in the pic and in the 3rd link, says it sonly for a short sweep guage, so if i get the fancy one that is "long sweep" what sending unit do i use, if this one says for "short sweep only" and its the only one they sell?
EXTREME PSI : Your #1 Source for In Stock Performance Parts - Auto Meter Cobalt Gauge : Oil Pressure 0-100 PSI
EXTREME PSI : Your #1 Source for In Stock Performance Parts - Auto Meter Cobalt Gauge : Oil Pressure 0-100 PSI
EXTREME PSI : Your #1 Source for In Stock Performance Parts - Auto Meter 100 PSI Electric Oil Pressure Gauge Sender