Does the brand need to match. I found 2 gauges : One by Jucuzzi is 25.00 and a different brand for 5.00. Both say 1/4" back mounted. So seems like the cheaper would work. Would the different brand matter or affect the readings? Orginal was up to 60 PSI. Ive seen some ppl here that wanted to get like up to 20 instead. Does it matter???