aftermarket rev guage fitting

[martyboi]

hi guys, got a 1.2 rn 1997 with the d7f engine. ime trying to fit a rev gauge and was wondering where to take the (rev puse) from:S , as it doesnt have a rev count as standard, and i dont think the wiring is there for one. any help would be appretiated as ime planning to fit nitrous , and i need a rev count to set it up