Thread: Speedo Recalibration C1600

I've installed the C1600 as per Slunnies instruction, however on looking over the information sheet I'm confused as to where the dip switches should be. Mathematics was never my strong point...

I would be very grateful if someone can help me out on the dip switch selection -

I have a stock auto Discovery 2a V8 - 2003 running with 265/70r16 tyres. (31" diameter). my diffs are still factory - Ratio - 3.54:1 ?

thanks Lee

I'm going to install mine tomorrow so will let you know how I go but I was hoping that new tyre size / old tyre size would give me the rough ratio to work with but I may be completely wrong.

I have heard it's a bit of trial and error finding it otherwise.

I fit mine last night - took it for a test drive this morning before work and the needle on the speedo hasn't moved a bit. This as expected is not recording the trip distance on the dash cluster... not good.

Wiring - 12vdc (powered by key turn in ignition) to red wire / black wire to ground on chassis (up high on left hand side of glove box) / Green wire (No blue wire on my C1600) to Pink/Green wire going into Grey connector on SLABS ECU / Brown wire going to the cut Pink/Green wire running with rest of wire cluster / White wire not used.

Trial and error... but forever grateful for assistance..

Thanks

So I had my green and brown wire the wrong way round! Uber idiot - with the current dip settings I'm running 5 kph slower compared to a GPS.

Trial and error on dip switches now...

Thanks Ollie

Mine arrived today.

i have the same diff ratios and sized tyre what was the dip switch combo you used?

Mick

As an FYI on my 245/75/16 I had 10101010101010

Originally Posted by Shakey

As an FYI on my 245/75/16 I had 10101010101010

Standard diff or 4.11s?

Standard. Diff sizes won't make a difference to the speed I don't believe from the earlier posts, but a may be wrong