rev counter

[roofer]

can anybody tell me how to wire rev counter up on my 2 litre merc xr2,thanks in advance.

 

[Jon Fuller]

black/neg to post marked 'GRD', Purple/switched ign live to post marked 'bat' or 'I', Grey to post marked 'S' or 'sig'

 

[roofer]

thanks for that jon.