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A vacuum gauge is an easy install with perhaps the need to drill a hole in the firewall at a suitable point to thread the vacuum hose through. I had installed one years ago to keep track of fuel economy. It will give you instant feedback on how much throttle you are using. It will bounce around quite a bit in stop and go driving.
It is less expensive than a scan gauge but will let you know when the economy throttle zone is reached with high vacuum numbers. The scan gauge will cost more and not require holes to be drilled. The scan gauge will also tell you much more. It is amazing how much the scan gauge will tell you that your current instrument panel will not tell you if you have a vehicle in the early years of the OBDII connection.
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