where to buy (vac/boost gage)
I got mine from Surplus Center.
Item no. is 28-2390, it is a 60 mm gage (2-5/8) scale is 30"/20 psi, white numbers on black and lighting is clear or red. Cost is 10.99$ and comes up to 20.99$US with shipping & handling fees. Kit includes fittings & flex. tube but no Tee.
I have it for 3 months and it works OK. there is a small needle shake under WOT, but it may be due to sensing point (on a line to the cruise control teeed from manifold pick up).