HBs don't seem to have a voltage stabiliser?...

[yoeddynz]

...for the fuel and temp gauge. Does this mean that at high revs they both might read higher?

Anyway- I want to some how adapt my RX7 temp sender to suit the viva gauge- it can be done using resistors wired in paralell or in series to change resistance on sender- anyone have experience doing such?

[StefanM]

it must be much easier to adapt the vauxhall sender unit to suit the engine?

[yoeddynz]

Yep- Ive ended up drilling and tapping a thread into an old mazda sender that I cut the end off.Viva sender now screws into that. Problem solved