Electric Speedo Conversion

[Rob Turbo 3]

Not a 205 I know but I want a speedo with a rev counter in my 306 and most of them seem to be electric not calbe driven, so how hard would it be to convert? I know I would need a gearbox sender with a digital output but what else would I need?

 

Thanks,

Rob

[Richie-Van-GTi 71 2 Cars]

thats it apart from wiring. I done that exact conversion on two 306's. The wiring for the clocks is already there. It just needs connecting betwen speedo drive and the chassis loom in the passenger side wing area.

Edited July 14, 2007 by Richie-Van-GTi

[Super Josh 4]

I quite fancy doing this to a 205, to get rid of the wobbly speedo needle that reappears a few months after changing the speedo cable.

Does anyone know if the electric 306 speedo gubbins would fit into the back of the 205 speedo housing?

 

 

Josh

[Rob Turbo 3]

Is it a simple plug it in and away you go type job?

 

I'll be off to the scrappy to get the bits, does the speedo sender need to be just electric or will one that has cable and electric do? Does the speedo need to be from a petrol 306 or are diesel ones the same (apart from I think the diesel ones the rev counter doesn't go as high?) and will the wiring need cutting off and joining or will it unplug from both ends?

 

Thanks,

Rob

[Rob Turbo 3]

Also, does it have to be from the same year or can I go for one of the later speedo's with the lcd display milage?

 

Thanks,

Rob

[tom_m 0]

I quite fancy doing this to a 205, to get rid of the wobbly speedo needle that reappears a few months after changing the speedo cable.

Does anyone know if the electric 306 speedo gubbins would fit into the back of the 205 speedo housing?

Josh

 

i need to do this, the dash bar in my cage means that the speedo cable won't go into the instruments anymore!

[Richie-Van-GTi 71 2 Cars]

later guages use totally diferent wiring, diesel tacho wont work either as it operates at a different voltage range. yes you can use the twin outlet sender but you must plug the cable hole or you will spray G/box oil out of it.

 

If you get clocks with electric drive speedo from the same pahse car as yours they are plug and play in regards to dash wiring, just 5 multiplugs on back to undo, later ones have only one plug and are a pain to wire but do-able. Hardest part is finding the correct wire in the loom in the inner wing. Its a pain to unwrap and find it as the mould over the wire numbers. I find it easiest to do a continuity check with a multimeter to find the correct wire. If you have a 306 haynes it should have the schematic for the guages and tell you which wire is which on the guages.

 

No idea if they will fit into a 205 guage assembly. Could well be worth checking as the wires really are simple.

[Rob Turbo 3]

Right, I managed to find a set of clocks from the same year car with a rev counter but cable speedo

 

The clocks also have an oil pressure gauge and I think an oil level gauge, problem is, neither the rev counter, oil pressure or oil level work (I wasn't expecting the 2 oil ones to work, there will be no senders for them)

 

The car they came out of had no engine or badges so I don't know if it was a diesel or not but the rev counter goes up to 8k and there was no bulb in the heater coil light so dont think it was a diesel, it seems that the wire is missing from the plug for the rev counter

 

On the plug that has goes to the rev counter theres only 4 wires and a lot of gaps, 2 are for indicators, one is earth and the other is the +ve for the clock that used to be there

 

Anyone know which pin on the ecu is for the rev counter on a 1.4 tu engine? (had a look on some sites with wiring diagrams but they only seem to have the 1.6)

 

Thanks,

Rob

[Rob Turbo 3]

Quick update!

 

I found the rev counter wire, pin 6 of the ecu (Bosch MA3.0) goes to pin 5 on the yellow plug just above the rev counter

 

Thing is, the pin is there on the ecu (obviously!), the wire is there from the ecu to where the loom plugs into the car on the passenger side inner wing and the pin is there where the engine loom plugs into the car, but oddly enough theres no wire on the plug that goes into the clocks!

 

Now for the next question, where do the wires go into the car from the engine bay? they dissappear behind the wing but after taking the glove box out there's no sign of any wires there! Also, do they plug into another loom once inside the car? Alternatively, is there a gromet in the bulkhead that I could easily run a wire through for the rev counter?

 

Gone off topic from the original post but nevermind!

 

Thanks,

Rob

[welshpug 1,657]

From under the wing they go through the "mudflap frame" under the wiper motor to a massive multi-plug thats bolted to the bulkhead, with its opposite end on the inner side of the bulkhead.

 

you wont get a wire through there

[Rob Turbo 3]

So the wires go from the passenger side to the drivers side before they go into the car?

 

How might I get to the mahoosive multi-plug inside the car? Is it a dash out job? (looking like a fun filled sunday!)

 

Thanks,

Rob

[welshpug 1,657]

ERR, WOULDNT ADVISE IT!!

 

oops! didnt mean to shout yes the big plug is on the drivers side, directly above the fusebox.

[Rob Turbo 3]

Well I started removing the dash but got bored and drilled a hole in the bulk head and ran a new wire through from the ecu to the clocks!

 

Job jobbed!

 

Thanks,

Rob