Isuzu Trooper Owners Club UK™

JBjunior · * Joined: 29 Nov 2013 Posts: 15

For the 3.1 I have been told that they have a separate oil pressure sender for the gauge and the light, can anyone tell me which one is which? I only have the one that is under the injection pump and has one wire coming from it.

Also, does anyone know about the wiring for the tachometer? I see the connection behind the injection pump that has two wires going to one harness, does that usually tie in to a single wire or a two wire set-up as it goes to the gauge cluster?

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Rhanagar · Posted: Wed May 21, 2014 7:29 Post subject:

If you look through the wheel arch you should see what I mean. There is a union that screws into the block in front of the starter motor. One guage screws into the top of this union, the other into the end. If you start the truck, unplug one and look to see if the guage drops to zero. You have found which one is which. If the gauge is what is wrong then someone else can find out for you.

I assume that the rev counter isn't working. Considering the other issue have you taken the dash cluster out and cleaned the terminals. Could be poor connection there.
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1990 Isuzu Bighorn LWB Mk.I 2.8TD Manual Lotus Edition
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto Lotus Edition

Deceased
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto LS

JBjunior · * Joined: 29 Nov 2013 Posts: 15

Thanks for the reply. I had seen the unit but I didn't see the second connection, glad it is all there together. This is going in to my petrol conversion so I am having to get most of this wired up myself.

It originally didn't have a tach and there is one wire going in to the tach but there are two wires coming off of the tachometer sending unit..... trying to figure out what I need to wire up to get it working properly.

Rhanagar · Posted: Wed May 21, 2014 22:12 Post subject:

On the 3.1 the rev counter is driven off the fuel pump.

Errm when you say "petrol" conversion .. are you swapping a 3.1 diesel into a petrol car ... or the other way round. Only ask as the petrol's were 2.6, 3.2, and 3.5.
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1990 Isuzu Bighorn LWB Mk.I 2.8TD Manual Lotus Edition
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto Lotus Edition

Deceased
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto LS

JBjunior · * Joined: 29 Nov 2013 Posts: 15

Gribble · Posted: Thu May 22, 2014 9:52 Post subject:

Cant be 100% sure but from the manual it looks like the black/reds join and the black is the earth .Might not read right as the petrol rev counter will go higher than the diesel one .

Wont the petrol diffs be a bit low geared for the diesel or is that what your aiming for ?
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Rhanagar · Posted: Thu May 22, 2014 12:34 Post subject:

Yeah ... you might want to swap out the rev counter ... if it will fit. Failing that find some clocks off a diesel Mu, or even a 2.8 Frontera.

My initial thought on the black being an earth was my thought as well.

Gribble.

I know of quite a few people who swap diesels into petrols for that reason. To get the right speeds again they fit bigger wheels Wink

_________________
1990 Isuzu Bighorn LWB Mk.I 2.8TD Manual Lotus Edition
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto Lotus Edition

Deceased
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto LS

JBjunior · * Joined: 29 Nov 2013 Posts: 15

Thanks to both of you.