Try Bearmach. Somethings are OK from Brit Part. I went through three sender unites from Paddocks before buying one from Bearmach which has now been in there for a few years.
I need a few gauges as my 90 was originally a 2.5td and then went Def 200tdi by P.O. and from this weekend its going to be fitted with a Disco 200tdi engine so atm all the gauges are either not working properly or not working at all, so the question is as regards the small gauges is the wiring the same on aftermarket gauges as on std gauges
Yes, same wiring. For the fuel and temp you will need to use the durite senders, which are matched to the gauges. Might be a bit of hassle to change the fuel sender, but easy for the temp.
I am using Durite gauges in my 300TDi 90 (fuel, temp, volts, oil-pressure & clock) and they are very good.
Obviously I used the matching temp sensor (very accurate and gives real temperature readings, not just a white line with a band of red at the end) but the fuel gauge works perfectly fine with the OE sender so there was no need to change.