Quote:
Originally Posted by Mxfrank
I added the economy gauge from a 190E to my 190DT. Not so easy, but a very nice result. Since it's a general purpose pressure gauge, it can be plumbed to measure VCV vacuum, EGR vacuum, tranmission modulator vacuum, or boost. I keep it plumbed to the VCV, which mimics the manifold vacuum on a gas car.
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When I put the 617 engine into my 380SL, it already had the "economy" gauge in the cluster. Originally, I hooked it up to the main vacuum line as an early warning for pump failure but later re calibrated it (by adjusting the needle) to read boost and adding tick marks for each psi.
Just a suggestion for those using a boost gauge that also shows vacuum, it would be a very simple thing to add a switchover valve and a switch to monitor two pressures. It could be set for boost normally, but pressing the switch would read any vacuum source desired (VCV, Vac pump, Trans modulator, EGR or for real-time troubleshooting, locks or climate).