Paul,
Sorry don't know about the oil pressure sensor, but the vacuum sensor needs to
be connected directly to the manifold, the valved line is probably the line for
the brake booster, this will not give you an acurate reflection of the manifold
pressure. The brake booster line has a one way valve designed to hold the lowest
pressure that the manifold reaches to increase the effectiveness of the brake
booster. If the gauge is starting on zero but jumps as you rev the engine and
then holds the new value as the engine revs return to idle, this is the likely
function of the line/valve. Using a T-piece before the valve will allow both a
brake booster and the vacuum gauge to be used from the one manifold fitting.
Luke Clough
"Paul W. J. Stanley" wrote:
> Ok thanks for the help on the ammetre...so I bought some more gauges...temp,
> oil and vacuum. I have a few problems with the L20B though...
>
> Oil pressure:
> The factory oil switch thread is tapered I think and seems slightly smaller
> than the fitting that comes with the oil gauge. I tried to taper the end of
> it a bit with a file but it's way too big for the block...it screws in about
> 1 and a half turns so I need an adaptor that fits the L20B block...anyone
> what is the difference between the thread on the block and the thread with
> the gauge? It's a Trisco (cheap and nasty) from Supercheap.
>
> Vacuum:
> Where do I install it?
> The hose out of the intake manifold has a valve or something inside of it
> and when I use this hose the vacuum gauge doesnt read right. It sits on 0
> until I give it some revs and it jumps back a bit. When I hook the gauge up
> to the fittingright on the manifold it works fine, so I think the hose is
> blocked by the valve or whatever it is. What is it anyway?
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