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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
Posts: 3,861
Originally Posted by fredmeister View Post
Do yourself a favor and disregard the boost gage inside the tach. It is fairly useless as it is inaccurate. Its hard to see as well.

The best thing to do is buy a VDO mechanical boost gage and install it in the clock location and tap into the brake booster line for a signal. Way more visible and 100% more accurate.
There is plenty of posts here on the forum discussing this gage and its installation.

You will be amazed at the difference in behavior of the 2 gages when you compare them while driving the car. The stock one you are correcting with the sending unit is way off.
I'm one of the exceptions, then. My stock gauge is actually pretty accurate compaired to my aftermarket gauge, but that gauge gives more accurate detail with more dial graduations.
For those with inaccurate stock gauges, I would place the blame on the sending unit aging in that hot engine environment over time. It's just a variable resistor after all, and the resistance curve is sure to change with age.
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 04-24-2013, 01:33 PM
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