Has anyone come across a more compact (smaller face) gauge than the 29/32" dia ones we typically use?

The smallest I've found is here: http://www.miniaturepressuregauge.com/

I inquired about getting them in a rear mount and they came back with the following notes:

For steam driven models we only manufacture these in bottom connection

½” ranges: 0-80psi, 0-100psi & 0-120psi

If you want 0-150 psi, you will need to have ¾” or 1” diameter pressure gauges

1/2" Pressure gauge for steam driven models,
Supplied with nut & tail piece.
Price: 10 off @ 20.00 each or 1-9 @ £24.00 ech

3/4" Pressure gauge for steam driven models, reading 0-150psi,
Supplied with nut & tail piece.
Price: 1 x 9 off @ £20.00 each

Price: (Pounds Sterling)
Delivery: 10 days

Wondering if there are other options out there in a similar size?