vinodtrc. Hi, I also own a Maruti 800 1992 model. First of all make sure that it is the meter which is not working and not the sender. If it is the sender, Its a cheap fix and is available in MGP.
If it's the cluster, AFAIK
, instrument cluster is still an open part in MGP. Costs 1.5k or so. Contact the mgp dealer in your city to confirm.
If at all it is not available, you can easily get a cluster from scrapyard.
Last resort, get a T2 dash and cluster from scrapyard or new, fix it. T2 dash and cluster, together is straight fit in 92 model T1.