APC 7960 switched rack pdu

I am trying to monitor several AP7960. When I discover them, they are type APC AP7830. The only interface is 'lance'.

I created a template and queried the device - which returned...
.1.3.6.1.4.1.apc.products.system.masterSwitch.masterSwitchrPDU

but if I rediscover the device - it returns to AP7830.

I only want to monitor current, I have added
.1.3.6.1.4.1.318.1.1.12.3.5.1.1.4
under system OID, and under Monitors (which is correct?)

Even though I don't think it is needed, I tried OID for each a few outlets....
1.3.6.1.4.1.318.1.1.12.3.5.1.1.4.1
1.3.6.1.4.1.318.1.1.12.3.5.1.1.4.2
1.3.6.1.4.1.318.1.1.12.3.5.1.1.4.3

This SNMP/MIB thing is new to me, but I put Arista switches online in minutes, and this has taken hours with no success.

I even tried upgrading the firmware on two different PDU's - and that failed too.

So any help would be appreciated.

Thanks