No , the sending unit won't work with an aftermarket guage. When I did mine I put in a fuel cell with a GM 0-90 sending unit and compatable guage.Right now I have one in front of my cluster , but will eventualy replace them all with digital.I have one for the fuel allready , but am waiting until I get the oil and temp ones.

I believe the Isuzu sending unit is something like 0-120 or something like that , its not a common one at all.Jerry Lemond should be able to chime in and correct me on this , but I know for sure the fuel guage won't work.

The oil one should work as long as you get the right sending unit on that , that fits in the same spot.I think its 1/4 , but not 100% sure as I haven't done anything on my truck in a while , but I did look into the Cyberdine guages , and tehy will work for the temp and oil , with worst case scenario getting another sending unit that will fit , only thing is they aren't cheap , about 50-106 depending what style you get.

The hardest part you will find is getting guages that will fit into the holes , and then how to get them to mount in the cluster cover.For that I was going to get a piece of aluminum and put a back plate on.Hope this helps.