Connecting to Elasticache Redis Cluster from Peered VPC

I have a corporate setup that primarily has 2 peered VPCs at the moment. We want to provision Elasticache (for Redis) so that 2 EC2 IIS Web Servers (one in each of the two VPCs) can connect to the same Elasticache cluster, is this possible?

Currently I can successfully connect to the cluster from the EC2 instance that is in the same VPC that the Elasticache cluster was provisioned in, but the other EC2 instance in the peered VPC cannot connect.

I tried allowing all access through security groups, turned off firewalls, etc... but nothing works.

Any help you can provide would be greatly appreciated.