I stumbled on to one of these yesterday at a tool warehouse clearance.. I paid $30
64$ doesn't seem so bad...made in USA too

http://shop.store.yahoo.com/hm-performance/dicote.html

For most Diesel trucks & cars.
Supplied w/three popular adapter numbers. ( Mercedes adapter included.. I confirmed before I bought)
Has an easy to read 2-1/2" diameter gauge head.
Flex hose w/swivel head which eliminates the need to remove auxillary equipment such as power brakes, steering, air conditioning, & manifold.
Includes quick side release valve to reset gauge without removal of adapter.

Gauge Range: 0-1000 lbs psi (0-70 kg psi)

I'll delete this if needed..for the sticky program