try a mud pod or mud Console
I am having the same dilemma & just ordered a mud pod to put the switches and guages in. Ran the lines bhind the dassh and up through the seat box and will mount the tank to the bulkhead bar.
94 AA Yellow D 90 ST/ disco 200TDI installed!Luvin 300+ miles per tank
1982 Series 3 HCPU gone but missed