Not a lot of monitoring needed Jim. Yes the right side of the panel is oil pressure.. oil temp..amp gauge.. volt meter.. below it CHT, EGT, Left fuel, Right fuel. Tachometer on the right side of the main panel... below it is an ice detector for my carburator throat.
GPS is in the Radio you see in the panel.. It's a Bendix KLX135.. $4200 item when I bought it. Would prefer a moving map now.. but can't justify it.
Only thing Murphy makes in a tandem is the Renegade bi-planes. Nothing wrong with a 44" wide (that's 6" wider than a C185!) cabin. I like my wife beside me.. not behind me like an Afhgan lady.