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I use Autometer gauges, plumbed the vacuum line into an unused port on the top of the intake manifold.

What kind of sealant into the intake was used here?x2 on the intake mani
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i have the 3 pronged one, the original from 85'. how do i no if its still functioning properly?@Beehanger If you're desmogged, you can buy the manifold vacuum nipple from Toyota - they call it a "gas filter", I suppose because there's a screen inside to keep fuel in the manifold from entering the vacuum system (it's not a fuel filter). It threads exactly into that port on the top of your intake and has a vac nipple on top. The stock ones that came with the 2F had three nipples, but they make a version with only one. Part number 90917-11022.
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If you are still smogged, go to the parts store and buy a plastic vacuum tee. Pick any one of the vac hoses coming off of that triple vacuum source (also available new, part number 90917-11024). Cut the hose a few inches above the manifold nipple and put the tee in. connect the other side of the cut hose to the tee. The tee now leaves you with a 3rd barbed fitting that's empty. Get a long vac hose and attach it there, run it through one of the rubber grommets in the firewall, into the cab, and connect it to your in-cab vac gauge. I zip tie the tee to the big cluster of hard vacuum lines so it doesn't flop around. Here's the stock 2F "gas filter" with three nipples:
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I use this gauge from Autometer. No problems in about four years.
Put a vacuum gauge on it...i have the 3 pronged one, the original from 85'. how do i no if its still functioning properly?
I meant from a "keeping the gas from entering vacuum system" standpointPut a vacuum gauge on it...