1993 Geo Tracker Tachometer Issue

[fixkick]

to cross over tachos (substitutions)
id need to know the exact car spec,  or tag number on bottom of of the head.
oops you did.

34100-77E50
77E50 means. (let me hope is same as your car new, and not wrongly replaced by others )

so lets decode 77E50
this number is the whole head 34100- means whole
this 77 code is for J18 SUZUKI sport model. 
the 77E50 is not  in the world list of arts  (EPC no hits, odd that)
is this USA car?
is it 4wd, steel top, 4door ? but what year, sport J18  engine,  96 to 98? year?  ours uSE is 77EN0 code. all 3 years. code E3= Fed USA
the sport is nothing like any G16, the sport has  cop coils and the ECU/PCM sends very unqiue tacho single to a unique head.

so what  car do you drive there are 100s of heads used , and more world wide (vast in fact)
the heads vary by (factors)   Heads are most hard part of this car to source for these reasons and more. ask.

1. year
   
   
2. J18 or G16 engine (and others world wide,  called engine type codes some with very very unique distributors or DIS no distributor at all)
   
   
3. 4wd or 2wd the former gets tacho but  latter none
   
   
4. transmission type 3,4, 5sp (latter is manual trans)
   
   
5. calif, or FED use, (nag switch bs, but can be ignored this) but USA heads. have MPH, and outside USA KPH speedo, scales.
   
   
6. and by country up to 50 countries supported.
   
7. the car is not a sideskick or Tracker at all but is X90 or other suzuki car.  I need the VIN to know.
   

on cars this old , the Speedo cluster may be just the wrong one put in, by some PO , prev; owners.