[68gmsee]

If it were me, I'd go for something else besides a vacuum gauge. A vacuum would be of no use to me. I've used them before and very quickly decided feathering the throttle to avoid fuel consumption was not a lot of fun on these gas guzzling trucks. I do a tune it up at least once or twice a year and vacuum reading is part of that. If you drive one long enough, you know when to check for problems, anyway.