Fox 4 Cylinder to V8 Tach

GREAT thread...does anyone know if there is a diff between CFI tachs ol skool coil fired tachs ? I have a 93 LX that had a 4cyl n it but I put a 84 GT 2.3T n WC T5 in it while using a repinned MERKUR XR4Ti stand alone harness. It runs great but the tach won't register until about 2600 then it jumps up to where it pegs out sometimes n stays pegged until I blip the throttle again but it never registers the r.p.m accurately or just stays at 0???
 
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