>I'll give you all a hint, a $35 O2 sensor, the bung to be welded >to the manifold and a digital voltmeter are all it really takes. >There is a FAQ about this available from the fwd VW FAQ location >(which I am not currently sure of the location). I've personally >been wondering how HALTECH and Berg can charge highway robbery >prices for their little LED voltmeters. In short it goes like >this, the O2 sensor thread is same as 18mm sparkplug, you can >get the bung from Parts Place or elsewhere or get a "spark plug >no fouling" adapter from local parts store designed to keep >plug OK in an oiling cylinder, the adapter is male thread one >side, female on the other, grind off the male, drill a hole >wherever (remember beyond the merger of the exhaust from each >cylinder bank on a VW or before it if you want to tune each >bank individually with 2 sensors) drill a hole and weld/braze >her in. Buy a generic heated (3 wire) sensor, around $30 even >if you get a good deal, screw her in, appply 12V to heating leads >look at the output with said meter, .45V is stoich, lower volts lean, >higher means rich, two sensors are great for dual carbs. Whole >thing even if you buy a voltmeter should be less than $50. Of course >if you really must have a little LED display I can probably look >in some old Radio electronics and find an article about building >a little in line LED Voltmeter display for under $15. BTW full >instructions should be at lap.umd.edu in the vw_archives directory >under ExhaustAnalyzer, ftp as anonymous login and you should be >good, if anyone wants I will email you the full instructions if >you don't have ftp capability. Oh if you put 2 in close enough >to the heads you probably don't even need the self heating style, >you need it only if you are putting them far down line after the >merger, check local speed shops for the bungs and plugs to replace >the sensor if you don't want to leave it in, or if you only want >to buy 1 sensor and tune 2 banks individually. Thread is hypothetically >18 x 0.5 mm but don't hold me to that. > > >John Anderson (saving you money) >ja@coe.wvu.edu >'71 Westy, '90 Corrado G60 If you already have an accuraty volt meter this is fine. Otherwise add another $250 or so for a quality DVM Stephen '75 bus
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