14 replies to this topic

[hughzy69]

Hi guys, have noticed people have external rev counters and was wondering how these are wired in for these to work, I only have the 2 main clocks without rev counter. And something I would like to do.

Cheers Tom

[Ryang556]

Like Pontiac GTO The Judge style?

[Chance]

I want one of those on my bonnet!!!!

[Ryang556]

I'm not sure weather it'd look right on a mini, it'd look like a chavvy bonnet scoop aha

[Chance]

Haha I didnt know a proper external rev counter existed like that, learning everyday

[Ryang556]

Haha

They do look awesome on the judge though, but then again you never know until it's fitted!

[Chance]

How do you actually wire in an aftermarket rev counter??

[Ryang556]

How do you actually wire in an aftermarket rev counter??

Two wires into the coil, earth and a wire into the light switch to control the light in it, easy really

[Ryang556]

A better worded post from the past

Tach Connections:
Red wire to switched 12V supply on the fuse box.
Black wire to earth (anywhere that is a metal part of the car body).
Green is the sense wire and it goes to the coil (-) terminal (the side of the coil with a wire going to the distributor).
White is for internal lighting. I would splice that into any "hot" part of the dash illumination circuit you can find/access.

Edited by Ryang556, 25 June 2012 - 09:49 PM.

[Chance]

Superbo

Cheers mate

[mailman]

Sorry to resurrect an old thread, I'm just trying to wire in a tachometer for my mini so that I can be more confident of what revs it is doing, particularly during run-in period.

I'm not sure which wires do which on the loom and where is the best point to connect into.

With the Red "Ignition Live" feed, where is the best place to join into and which colour wire is it on the loom? Does it need to be a certain gauge of wire? Need fuses?

Same with White, I was planning on just trying to find a light that went to a lamp in one of the original gauges and splicing into it behind the gauge. Good idea? And again, wire gauge and fuse?

Finally, Green wire that heads to the -ve terminal of the coil, does this need a fuse?

I have a central Speedo/Water Temp/Oil Pressure set up at the moment.

The wire that I have is 2.5mm 6.8A, as that is what looked most like the stuff coming out of the back of the tachometer that I bought. Do any or all of the connections/wires require more than this?

Thanks heaps, will add a photo of my loom/back of speedo if that will help identification? Not sure whether all looms use the same colour wiring, or is that too optimistic?

Cheers.

[mailman]

Ok, so I have managed to track an enlarged and somewhat decipherable, it doesn't show exactly where the wires are but does give an indication to which colours do what (sort of).

So the question now is, is 2.5mm 5Amp wire sufficient? And does it matter where in the circuit I join into?

[dklawson]

The tach should draw very little current so the wire you have available will be fine. I suggest you confirm all your connections with temporary splices before cutting into the loom though.

I know you said you have sorted most of this out already but the following is for future reference.

• For switched power you can tap into virtually any (original factory) white or dark green wire behind the dash. The white wires will be switched/un-fused, the dark green will be switched/fused. The tach should draw very, very little current so which circuit you tap into is not going to be that critical.
• If you want to fuse the tach circuit, install the fuse in the gauge's +12V wire (typically it's red wire).
• The tach's signal wire (connected to coil (-) ) carries virtually no current so it does not require fusing unless it makes you feel better.
• I cannot advise anyone on where the best place is to tap into dash lighting for the tach. I feel there is no substitute for studying your car's wiring diagram to determine what is best for your car.

[mailman]

Thank you so much! That's much better than the info I had.

The wiring diagrams are very confusing for me and I know they shouldn't be.

[Gremlin]

I'm not sure weather it'd look right on a mini, it'd look like a chavvy bonnet scoop aha

He didn't say it was a Mini