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Old August 15th, 2013, 06:06 AM
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sc1337 sc1337 is offline
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Join Date: Jun 2013
Location: Greenville , SC
Truck: 4000 B-model
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Default Re: 196? GMC 4000 B-model

Quote:
The vacuum gauge on the big truck cluster is for the Hydrovac brake booster so in your case if it's going to be used in a light duty truck in won't work for that purpose. You can just hook it up to manifold vacuum as a mileage minder type gauge. The tach drive parts are definitely something you're going to have to search for, I've had a few of these in the past but have sold them off to other members but hopefully someone on this site has the stuff. There is a fitting that screws to the back of the cam then attaches to the tach drive so make sure that's included. As for whoever mentioned a tach for $50-$70 you're way off unless it's just a standard Sun RC-50 which resembles the GMC/Sun RC-5A. The RC-5A has the GMC style block numerals you won't find one of these for less than $300 and most won't include the transmitter box. I've seen some real outrageous prices on these tachs recently on ebay ranging from $450-$600.
well I have a 4000 with the hydrovac so do you know where/how its setup? I got the whole cluster for $35 so not bad In my book.
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