Boost Gauge in 190D 2.5 Turbo?...

[Jay Gibbs]

Has anybody tried to modify a 190 gasser instrument cluster "economy gauge" to be a boost gauge for their 190D 2.5 Turbo? As far as I can tell on a gas car, at idle the vac pressure would be about 18 to 20" and would put the needle all the way to the left side (black side) of the economy gauge, and at full throttle it would put the needle all the way to the right side (red side) of the arc which would indicate roughly atmospheric pressure...

Sooo...from what I've calculated, 18 to 20" of manifold pressure equals about 10 psi...so if I re-index the economy gauge needle all the way to the left (and assuming the 190DT's max boost pressure is between 10 and 11 psi), my "modified" economy/boost gauge should peak out right about the top of the red zone at 10 to 11 psi full boost pressure...yes????

I'm messing around with a gauge I have on hand...I'll have to change the face to an earlier 190 one which didn't have a "premium fuel only" notation on it and just has a picture of a "gas pump" instead...trying a Brother p-touch label maker to make the "Turbo" notation...wish they had matte black tape with white lettering...I've only found gloss black tape...

Thanks, J.G.