Oil Pressure Switch

[kristafa]

fyi: rb20det in e36 bmw

on the side of my rb20 block i can kinda get to this oil pressure sensor lookin thing - which i'm not using since i have a sandwich plate with sensors in it.

Thing is, i really want to wire in my 'OIL WARNING LAMP' in my bmw cluster, so i need to locate the oil pressure switch on the rb motor (which i assume is not a variable type resister like a oil gauge uses, but more like a on/off switch which i can use to control the relay for the dash light).

That oil pressure thing that i've located, well i tried testing it with my digi multimeter but i couldn't find out difinitively how the bastard works.. Anybody shed some light on this matter for me pleaseeee...

PS - any help on wiring my tacho in too would help.. i have a aftermarket tacho at the mo, but i would like to use the orig instrument cluster tacho! I know a few ppl on this forum have done bmw conversions b4, so share the secrets..

Cheers, Chris.

[blind_elk]

RBs run a gauge, so the pressure sender is a variable resistor (the pressure sender earths the gauge). If you aren't running a gauge, but only a "OH SH*T!!!!" light, simply replace the RB sender with a BMW sender / switch. (have I understood your dilemma correctly?)

Wiring the tacho depends on how the BMW tacho works and how the Nissan tacho works (whether they both use square wave signal, or some other signal).

[shanef]

its located on the stock oil cooler/filter sandwich plate that bolts to the block.

[kristafa]

RBs run a gauge, so the pressure sender is a variable resistor (the pressure sender earths the gauge). If you aren't running a gauge, but only a "OH SH*T!!!!" light, simply replace the RB sender with a BMW sender / switch. (have I understood your dilemma correctly?)

Wiring the tacho depends on how the BMW tacho works and how the Nissan tacho works (whether they both use square wave signal, or some other signal).

now that makes perfect sense! cheers.

consider this thread solved, thanks