lyonsfin

I have read several previous posts. Gauge was not reading above 3 bars, disconnecting and grounding the sender wire produced 5 bars and 0 bars respectively. Replaced sender and then gauge pegged to 5. Purchased a good used gauge and still pegs all the way up and does so when wire is removed and grounded.
First question, did I screw up the wire connections at the gauge? Anyone know the actual connections?
Second, is there a way to test the gauge or sender?
Thanks

Josh