Which gear indicator to fit

I fancy fitting a gear position indicator to my 07 SDR. Just find it easier learning tracks if I know what gear suits a part of the track.
Fitted a GIpro to my RC8 and was quite impressed how it helped me at Donington (even though I dropped it at Redgate) but I thought the response time was not quite that of the factory fit ones.
Anybody fitted anything else recently that might be an improvement
(Need to be able to buy it in the UK)

Thins is.....I fitted a GIPro like above. Happy with it though, doesn't seem too much delay or anything but this is only on the road over the last few weeks and I've not redden fast or I have yet to see it doing it's stuff on a track.

When i bought my sd, it was fitted with a gipro gear indicator. It matches the revs and speed and calculates which gear you are in. It works great on the streets, never been on a track so don't know about that.
Don't know id you run different sprockets on different tracks, in that case you have to reprogram it every time, because the rpms won't match the speed anymore.
A pic of the indicator fitted on the bike:

It is mounted on a simple alu strip on the headlight bolt with double sided tape. Works perfect.

Here's my GIPro built into my rear view monitor unit.

I use a Cartek one as listed in the how to I did.

Spot on. Changes instantly. The higher up the rev range you program it the more accurate it is. You need a long straight quiet road though as trying to touch the two wires together at 100mph is fun.

Also handy as a wheelie indicator as the bike uses the front wheel for speed, you can loft it in 3rd and watch it confuse itself and drop all the way back to show 1st, then bangs up to 4th on landing.

Programmable shift lights are a great touch too.

Only negative is its a black number displayed with a choice of background colours. Can still see it ok on a quick glance down but it's not really bright when riding in bright sun.