If you have an android phone... the "Torque" app is very good. Depending on the year of manufacture of your Defender, if it is OBDII compliant then this app ($5 approx for the full pro. version or free for the limited one) plus an ELM bluetooth OBDII plug/sender (about $25 from ebay) ... for Td5 Disco see
Torque App for Android Review - Land Rover Forums - Land Rover Enthusiast Forum where he lists all the parameters available incl turbo boost, vacuum, volts, MAF, O2 sensors etc
if you're not a member of that forum and the pics won't open , then have a look at an example of availalble gauges on a Thor engined P38...see post #1 of High Long Term Fuel Trims - why?
A cheap 7" or 8" android tablet permanently mounted might suffice and encompass all your needs incl. GPS/Mapping/RAVE etc as well
it may be a start to design your very own "glass cockpit" !
MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
2020 Subaru Impreza S ('SWMBO's Express' )
2023 Ineos Grenadier Trialmaster (diesel)
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